No Sleeves reigns #1 to me. No contest there whatsoever.
My other votes went to YJ and PB; they need to bring 'em back and do more stuff togetherz.
Special mention goes to Watarirouka, 'cuz you can't forget about the other Production Ogi subunit.
Tbh, I pretty much like all the sub-units, minus Team Dragon (can't really wrong with senbatsu members, but the grouping seemed a little forced to me)