I'm a bit biased since Team A has my favorite members (Taeyeon, Sica, Yuri).
First of all, I think Team A has a lot more diversity in terms of style, but that may just be a consequence of having the most members.
Jessica alternates between princess and cool/sexy girl styles on a regular basis. She's also hands down the most feminine of the group, and probably wears dresses and accessories much more frequently than the other members. I think she'll be the go-to girl for Team A when it comes to more glamorous, glitzy, or lady-like styles. And not that Jess usually wears much makeup, but based on my instinct and the packed counter in her room, Jess is probably the most knowledge in the group when it comes to makeup.
Taeyeon seems to have the cute/dorky girl next door style down pat. Hmm.. like the editor said, Taeyeon's style isn't very memorable. But based on pics of candids of Taeyeon the girl does know how to dress herself, so we can assume she knows the basics of color and pattern matching. Taeyeon also has incredible pure skin, which means she is either highly knowledgeable about skin care or is just naturally gifted (probably the latter).
Yuri has the more active girl next door style around her. Problem is, I don't think Yuri's fashion style is very unique either. It's occasionally different from the other girls in the group but it's not very consistent and defined. On the plus side, Yuri will be an excellent model if they ever have to use one of their own members to show something off.
Yoona is pro at the pretty tomboy kind of look; it looked like her clothes were all button downs and jeans. But once again that's kind of a boring look if you think about it and doesn't seem sophisticated enough for a fashion magazine. Like Yuri, she'd be the top pick for a model if the group ever needs one, though.
And Sunny seems to have a distinctly cute and girly aesthetic (did I mention she has HOT body? Christ, it's hard to believe she's the shortest when you see her legs). No offense to Sunny, but since her face isn't so stunning, I'm sure she's used to putting a lot of thought and consideration into her style of dress. Some of the best dressed girls I know aren't really THAT pretty, and it's probably because they felt the need need to compensate for lack of natural gifts with fashion sense.
Not only that, Team A also has the right mesh of personalities, as everyone has mentioned, to get things done.
Jessica seems to be the slave-driver, perfectionist type who'll push the group to maintain high standards. I like to think her suggestion that they "come out hard" and refusal to let Sunny use the Bunny was key in getting the group to take a chance with the snake. Also, due to Sica's very polite and careful way of speaking, she'll be capable of acting as the group's representative for formal communication. Only cons is I think Jess might come across as too bossy and her prissiness will probably result in "delegating" (passing off) tasks she doesn't like to everyone else. Oh, and although she works hard in general, Sica always seems very fragile and low in stamina. Falling asleep during tasks could be a real danger, haha.
Sunny, as demonstrated earlier with the snake suggestion, has the ability to come up with unique ideas (maybe that's due to all the games she plays, who knows?) and has shown that she's willing to bite the bullet and put herself on the line for the team. She handled the snake without complaining, even while admitting she was frightened, and was basically the MVP for Team A this time around. Great asset to the team as a whole, and I think Sunny is going to gain a lot of fans during this show if she keeps showing this strong, creative side to her. Hmmm... based on my previous impressions of her personality, I think possible problems with Sunny would be that she's probably someone who's easily distracted, play around, and take it easy.
As for Yuri, I hate to say it but I don't see her being much of a direct asset in the creative process. I was also surprised that she was too scared to help Sunny with the snake. I think Yuri will be important as a mood-maker for the group, to keep people's spirits up (particularly Sica's) and handle any task that requires lots of energy, athleticism, and/or talking to others. I've always felt that Yuri, despite her jokester nature, has a strong sense of responsibility and pride. I think that at some point in this show we're going to see Yuri's serious nature. Possible cons are that Yuri can be pretty stubborn about certain, specific things, though she's never really bad natured about it. And I don't see her as someone afraid to speak her mind when she has an opinion. She may clash with Sica in the future.
Now for Yoona. Everybody likes and misses Yoona as she's never really with the girls anymore (absence makes the heart grow fonder, after all). Don't think Yoona will contribute much to planning/designing since she's so quiet and doesn't seem to have a strong concept of style. I don't think that anything spectacularly good or bad will come from Yoona's presence; she's really just there as a pretty face and a possible model.
Okay, now Taeyeon... If Taeyeon keeps shuttling in and out of missions like the first episode, we're going to see Sica taking over as leader pretty much all the time (this would make me happy). This won't be a problem as Taeyeon is very modest, and she doesn't feel a need to arbitrarily lead the girls in every affair. If her schedule prevents her from being there and following what's going on, Taeyeon is more than happy to let the other girls clue her into the situation, and even order her around as it's probably for the best. Plus, I think Taeyeon appreciates the chance to relax and let someone else take over the reins of leadership. Furthermore, I think Taeyeon's built-in sense of responsibility for all the girls is still going to play a role. If there's something dirty/scary/difficult that the other girls don't want to do, Umma will be responsible and take over without (much) complaint. I don't think that there will be any problems with Taeyeon as she is very laid back, and because I think she's probably the most beloved by all the other members of SNSD. Seriously, there was so much love for her from BOTH teams when she came in to help finish the shooting.
I guess I'll write up something about Team B later, haha. This is like an essay by itself >_<.