A few collections i've been reading are the sci-fi and fantasy masterwork ones by gollancz. A few standouts have been the dying earth by jack vance and A Voyage to Arcturus. There are some amazing works in here which i would never have found without the curation that shows the history and evolution the genres. https://www.worldswithoutend.com/lists_fantasy_masterworks.a...

https://www.worldswithoutend.com/lists_sf_masterworks.asp

I own, and have read, quite a few novels from the SF Masterworks series. It's my go to for decent quality reprints of older sci-fi. Can definitely recommend.

I've read a lot of these, but many that I've never considered masterworks. I mean, I'm a Dick head, but that's a lot of representation on the list.