you can have whatever reason youw ant, like maybe the exclusives were better or something
just make sure it was released during a gen, so i think the first mystery dungeons were gen 3 i think.... usually consoles etc are how you'll see.
1. yellow? purely just because of pikachu being your starter and that you got them following you. idk, original games or not it was kind of... boring. and colourless. no real place to customise, nostalgia aside.
2. gold!!! its the game i started playing on. i'd say crystal because of the new features but i dont remember much after my godmother destroyed the cartridge rip my life
3. emerald lmao, close tie with the original mystery dungeon... i think i got the original one on the GBA? i know there was one on another thing as well, but ag my memory fails me.
4. HGSS. everything about it is perfect despite my indecisiveness. nostalgia might have hit me like a bomb tho who knows. platinum or time/darkness tied for second.
5. ughhhh hard. bw1 for shiny charm, bw2 for gameplay, uh... i don actually remember a lot lol
6. XY or ORAS... prolly XY due to the outfits and gym designs. ORAS kinda flunked a bit on that one.