They're both duos. Anyway it says start in shikai, but unfortunately none of these individuals have yet revealed their bankai so they're limited only to their shikai. Yoruichi even less than that. But honestly, while I feel Shunsui would be very problematic, I feel that out of the 4, Ukitake is the weakest link. It could go either way. We won't know until we see some bankai, however as it stands, Yoruichi and Urahara as a pair are more impressive than Shinsui and Ukitake have been.
They are the oldest captains by far now that Yamamoto and Unohana are, let me say "somewhat out of the picture", also they are the only dual zanpakutou users other than Ichigo himself (don't know what that means but it seems special) and of all Captains, Shunsui was picked as head Captain. That's got to mean something. Kubo also said that he wants readers to think that Shunsui's bankai can beat Aizen. That's kinda crazy but if it's the author himself sayings its possible, I guess it's possible. But I went with team one only based on feats thus far. Powerscaling doesn't really work here IMO.
Really the battle as a whole in't quantifiable yet. We haven't seen even one of these guy's bankai and not even Yoruichi's shikai. We know that they all have immense shunpo skills and that they are among the few ranked as shunpo masters with Yoruichi being the best. We don't know their Jirou prowess compared to one another and so on. Shunsui's bankai is supposed to be insanely powerful, Yoruichi can fight on par without a zanpakutou etc. We don't know anything close to their full potential yet. However if we base this fight of of their current showings alone, I'd have to say team 1 is a bit more impressive.