I used to collect various systems and games but nowadays don’t have much left apart from my Dreamcast stuff. Cost, storage space and just the risk of something becoming unplayable mean emulation is my go to now.
PS1 is probably my most played system, I used ePSXe for years but recently switched to Duckstation and so far so good. Some of my all time favourites are GT2, Future Cop LAPD, Devil Dice, Colin McRae Rally 1/2.
If you want something to play on Dolphin then the GameCube version of Skies of Arcadia is excellent.