Sims 3 is superior because I can play it on Steam.
Sims 4 needs Origin, and I hate having that thing on my computer. It is literally the only game I need that god forsaken program for.
Another thing, being able to pick your hair and clothes colour from a friggen colour picker (more so the hair cause it's usually my characters that I'm making in this game), why did they get rid of that for TS4? I don't understand?? They make everything else a lot more customization for CAS but then they remove THAT??? Despite everything they added that small thing being removed feels like a step back and makes it feel like I have LESS customization options even though that's clearly not true. They're just all on the body sliders.
Sims 4 is.... fine... if you have money to burn. As yeah, it gets more enjoyable the more packs you have to cator to your style of play, but I'll still echo what a lot of people have been saying, there is too little content in all their expansion and stuff packs even though there is so many of them. It ALWAYS feels like I could do more in TS3 than I can 4, and it's not because it was out longer. That said, the packs that are similar to one another usually is more polished for 4, but is not as content heavy or exciting as 3, cause you're not really constantly running into stuff that surprises you.
Pets are also a lot more fun to play in 3, but they're also really well done and act more like pets in 4.
Oh yeah, another big thing that urks me, it takes friggen YEARS for EA to fix their glitches in the Sims 4 even when they are game breaking. I don't remember it ever taking this long to fix bugs that literally broke the game for Sims 3. Only this year did I get a fix for the glitch that made it impossible for me to progress in police job line for Get to Work. For an idea on how LONG it took them to fix those glitched Get to Work was released in 2015 with the glitch existing since release (AND KNOWN BY EA)
There was also a glitch with the hamster cages, they were just WAY TO INTERESTING for every sim in the house hold, if I put one in the house all the sims (both people and animals) would go over to the cage and just STARE AT THE HAMSTER WHILE PISSING THEMSELVES UNTIL THEY STARTED STARVING TO DEATH and even then you manually had to force them to go eat. This was really frustrating when you had pets and children in the house because that counts as neglecting their needs and having services take them away. Obviously the best option was to not give them that pet at all, but that pet was also a separate 12$ add on (and really the only reason you'd want to buy the pet stuff pack)
The things I like about the Sim4 is mostly performance, it loads a lot faster on my computer, the build mode is also a lot better but damn I really want the spiral staircases back. They took up so much less friggen room. I also really like the options Sims4 has in their create a Sim menu that allows for you to make trans characters, but as mentioned before in this thread, is sucks that the games auto generation doesn't also do this when filling your world with sims.
Another thing for CAS mode is that I REALLY wish they had more black hairstyles... I mean... like... really curly/kinky black hair not the hair colour...)