Sims 2:
Pros: extremely detailed gameplay, fears and wants, so many things to discover (it took me 15+ years to learn that tvs can fall off the wall), that little penguin who walks around, actual consequences for your sims, memories, slightly darker humor, cutscenes!
Cons: the clothing style is stuck in the 2000’s, building feels awful, a lot of features are broken which requires mods to fix them, and using in-game features can corrupt your game (this one is the worst for me. I love TS2, but the fact that i have to be so careful of what i do to avoid corruption, makes me not wanna play)
Sims 3:
Pros: a lot of different things you can do gameplay wise, the worlds are beautiful, create-a-style was nice, did one of my favorite songs in simlish (1+ from me!)
Cons: the sims looks ugly, open world, probably caused the deaths of at least 3 of my old laptops
Sims 4:
Pros: beautiful worlds and sims, runs great on my current PC even when i have 10+ GB of CC, building feels a lot nicer than the previous games, the gallery is great, i can play for hours without getting bored
Cons: not enough traits and aspirations, some age groups gets neglected in favor of YA (especially female YA’s), there’s no real consequences for most of your sims actions and nothing bad ever happens to them, the lack or NPC’s like firemen, robbers, etc