PS5 disc or digital if you own a pile of ps4 discs?

PS5 won't play PS3 or PS2 discs at all though, only PS4 and PS5. If you've got some of those, keep the old console.

Disc, no question. The digital PS5 can't read any of those discs, and most of your PS4 library will play on a PS5 from the disc. If you're looking at the slim, the digital one can take the detachable drive later, but buying the drive separately costs more than just getting the disc model in the first place. Worth checking the price difference where you are before deciding.