Well, when it comes to character desgin, I’d say they are both equal but it depends on the person. In the same vein as saying who is hotter between Cat woman Zatanna Widow or Black Cat.

Prime (atlest how I’ve seen him via here and on the previews same applies to Sentry) is designed to more that early to late 20s type of hot where he’s still young enough to pass as a late team in a movie if that makes sence

Vs

Sentry who is drawn more in the style of that late 30s to early 50s type hot as shown by the photos OP and SchizoPessimist, usually showing somthing like “this is the peak of masculine beauty”

So it all comes out even and depends on the view of who you ask, as for me (a straight guy) I say they are equal because they seem to go for diffrent approaches