Schnabel's edition is a holy grail of sorts for Beethoven's 32. The scores are shot full of Schnabel's own interpretations, covering dynamics, articulations, tempo changes, phrasings, and so on... the point being: this is a freaking detailed edition done by a revered Beethoven scholar/performer whose recordings weren't always able to convey perfectly his ideas.
The problem with Schnabel's edition is not just that his innovative fingerings can be bizarre or uncomfortable at times but that the pages are so strewn and cluttered with fingerings and details that it becomes annoying to deal with.
Because of that, I read from the ABRSM Tovey edition. This edition has detailed commentary before each sonata that I've found to be extremely useful, but the main reason that I use it is because the scores are just so clean and easy to read. I'll usually learn the sonata using the Tovey edition, and then when I'm polishing the sonata, I'll go through the Schnabel edition measure by measure to see if there's any fingerings that work better or any interesting articulations worth trying out, and so on.