Best Roster Verdict: AEW Wins
Personally, although the Usos have had some good matches, I think that both the Lucha Brothers and the Young Bucks are better teams. Perhaps it is because they aren't restricted by WWE's booking, but I've just been more impressed with their matches over the years than the Usos.
You can usually predict every spot in an Usos' match as there will likely be suicide dives, superkicks, Samoan drops and top-rope splashes. Sure the Young Bucks do some similar moves, but they are much more innovative with their offence.
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A lot of people would probably say that WWE's division is better, but have you watched wrestling outside of WWE? Angelico and Jack Evans were amazing in Lucha Underground and were a great signing for AEW. Angelico is literally a daredevil, having jumped off of several platforms above the ring while in LU.
Best Friends are New Day Light, but they have their own tendencies that are just as endearing. And SCU does the scummy bad guy thing better than anyone, but they can also be the good guy team that you want to root for.
It was no surprise that AEW said they would feature tag team wrestling because WWE hasn't featured tag team wrestling in the best light. It doesn't hurt that two of AEW's Executive VPs are tag team wrestlers either.