I think Henle is great for the beethoven sonatas. I have the hardcover editions and I like them very much.Agree with you that the Jan Ekier binding sucks, at least when I bought the Chopin Sonatas in 2018. Don't know what they were thinking putting so much work into making an authentic edition and then binding it in a terrible, useless book.
Ekier's is nice but I always liked Paderewski's layout more.
I'll add to hmoll53's comment on Barenreiter - I have some Debussy and Bach with Barenreiter and I am very happy with it. Don't know how they fare with the Beethoven sonatas but I'd be surprised if there was a huge dip in quality. They can be expensive though.