I'm sure you're all (and, yes, I mean allllll of you) wondering what is the difference!?! What could possibly make Sims 4 different than Sims 3 and why should I pay for Sims 4 if I already own Sims 3...
Well...the main and only difference is...ABSOLUTELY NOTHING!
You will pay for the same things...same 'expansions', same 'new' abbilities, same 'new' potentials...
Everything is the same, you're just starting it all - all over again. Meaning you're not going to be able to swim, have toddlers, go on vacations or do anything specifically fun that you can do in Sims 3 with expansions installed.
You can, however, go to work with a Sim of a medical, police or science profession. That is...IF you buy the expansion for it.
You can go on 'vacation' on a camping grounds IF you buy that expansion...
Only thing that's a tad bit different, and it's purely aestetic, is that you can change your Sims' body in a bit more detail, and that's about it.
Graphics are a bit improved, but that's a given each time they 'reinvent' the game.
The prices are high, even after a few years of when the 'new' Sims 4 were released, and even on a discount...not positive they're worth it.
If you feel you'll still get a kick out of Sims 4, then so be it.
If you feel you're more than happy with the entire and complete set up of your current Sims 3, more power to ya!
IF, however, you feel you'd rather save your money for something actually useful...like a coat or a car...then I gotta say: