Sonata, you might already know about this, but have you tried the Spotify service? I have only flirted with it on its advertising-driven (bleck) "free" option, but I wonder if you could try out many sonatas by many different hands that way. I don't yet Barenboim's sonatas at all, but I remember liking Brendel's earliest Beethoven cycle on Vox (?) more than most of the much later analogue/digital recordings that he did----these earliest recordings having been recently reissued by Brilliant in a few different forms: in the most recent enormous Beethoven "complete" edition; also in that mammoth Brendel VOX/TURNABOUT/VANGUARD box; and more manageably in this box:
There seem to be many seasoned listeners who like this early cycle (albeit in inferior sound) quite a bit more than his later traversals. FYI!
Elsewhere I offered recommendations to you for cycles by Gulda, Arrau, and Backhaus; but those are just names that have excited me recently. It's hard to imagine you'd not enjoy the hell out of Brendel's approach; I intend to return to him eventually. I just recently listened to this late recording of the DIABELLI VARIATIONS, allegedly Brendel's personal favorite recording of that mountain (iirc), and I was knocked out: