Sims 1:
Pros- Sence of humor, the concepts of the expansions (Hot Date and Super Star were my favorites). I was a young tween when I started playing and I played for enjoyment. So many funny and cruel things you could do.
Cons- No aging, no real costumization, no family ties, no genetics.
Sims 2:
Pros- Best gameplay and animations. I love that my families feel like family. So many things for my sims to do. I loved the Open for Business Expansion and it was so much fun to build different shops. There were so many activities for almost all the life stages. I love that the sims themselves had personality and they were all different.
Cons- CAS- no separate shoe/accessories categories, Build/buy- Nothing really seemed to match and lack of cabinets and curtains. Building houses is a lot harder than I remember.
Sims 3:
Pros- Open world (I never really had problems with the lag), Family relationships (I love that sims know who their step-siblings/step-parents are plus other family relationships such as aunts and uncles) My favorite expansion packs were probably Generations and Seasons as they add a whole lot to gameplay for all life stages. I love the little details in the game as well.
Cons- Sims don't look that great, build/buy is really ugly as well and I downloaded a lot of cc for this game. No connecting worlds or being able to travel between them.
Sims 4:
Pros- The CAS is amazing and the sims look amazing, too. My favorite looking sims out of all four games. The build/buy is also great. It's not hard to decorate and a lot of the pieces fit together great. It's easy to make sims and build houses. I love the stairs tool we got not too long ago. The toddlers are the best out of the last 3 games (I wish they had put as much effort into the other life stages as well) The game runs well and I've never had lag and overall the game looks great.
Cons- No open neighborhood/world, no family relationships to speak of. It's almost like a bunch of random sims just live together doing their own thing. No personalities (all the sims feel the same), no drama, the sims themselves are too happy all the time. Reused animations everywhere. It lacks the most in gameplay which can not be covered up by how great everything looks unless you're only playing to make sims and houses but I actually would like to play the game too but it bores me to death.