Sims4 doesn't make use of the better graphics cards, the game can lag sometimes on people who are running very high-end graphics cards. So if you want to play just the sims4 then you should be fine with one of the cheaper cards. The increased VRAM could maybe help with performance a bit, but not much. If you play with a lot of cc, then a better graphics card can help the game with rendering that better, because cc often uses very high resolution textures.
What I recommend though is a good CPU, because it helps with simulation lag.
I would go for the 2060 but I play other games, I have a 1080 and I like it a lot, it's silent, powerful and fast.