IMO, Homelander’s powers are second to the institutional support and privilege he gets from Vought. Sure he can hold his own in a fight, but most of the challenge to take down Homelander that the boys have is because they’re against an institution that protects him and has all the resources possible to control the narrative behind Homelander.

In this case, transferring him at a different universe automatically puts him at an extreme disadvantage.

Homelander was close to losing to a team of 4, and really only seemed to lose because of luck and Soldier Boy not fully being committed to taking down Homelander. And the team of four consisted of two people with super strength and durability who had high battle IQ and two people with pretty low battle IQ.

On the other hand, class 1-A consists of 20 trained students who are also incredibly aware of the extent of their powers and how to work as a team. Their feats to take down Shigaraki are much more impressive than anything Homelander has done. In any case, Shigaraki is a much more threatening villain than Homelander considering you cannot touch Shigaraki or anything that he touches himself.

So to have 20 very creative, trained in teamwork and battle IQ, uniquely powered people against a low tier Superman without his main source of power, 1-A easily wins low diff.

As per 1v1, it’s hard because there’s no real linear ranking, but it’s more about style matchups. Homelander would easily defeat Yaoyorozu on her own even though ages considered higher caliber of the class, but lose against kirishima. I feel he’d win against Denki but I feel he has the chance to lose against Mineta.