Sims 4 is certainly better optimised when it comes to adding more content to it, it used to be a problem with me for sims 3, it's why I never got island paradise and stopped getting more content at some point.
But I have a new computer now, which was optimised to be able to run Warhammer 2 on highest graphics at optimal capacity. So for me personally, sims 3 runs very good. The initial load time for the game is a bit longer than sims 4, but I get to play a game there that gives happiness points for the selected household.
I have a few accesoires packs, all big expansions save for pets and island paradise, and a few sets and stuff from the store. Pretty much what the free points could get me.
That's also some additional enjoyment for me I suppose, being able to run sims 3 perfectly now while I couldn't before.
But still, as great as sims 4 looks visually and as optimised as it is, without quirky sims to occupy it, it's just a beautiful empty shell. It's fun to build houses and sims with it, but whenever I actually play it, it becomes appearant straight away that all sims have the same personality.
And to me a lot of the fun in sims 3 is making quirky unique sims though interesting trait combinations.
I know sims 3 has some meaningless traits too, mainly those that just help improve a specific skill faster, but some really have a big impact and truly gave your sim character and a lot of extra conversation and interaction options.
And since they get five traits, you can mix and match it nicely, always ensuring they have at least one trait that truly has impact.
