I tried Sims 3 and Sims 2 UC on a technical pre-Version of Windows 10 and had no issues starting either. I didn’t play for very long though.
Depending on your Graphics Card/Computer, it can be necessary to start the game in Windows 7 compatibility mode. As far as I know, there’s no official statement whether Sims 1-3 are supported on Windows 10 or not.
More Details when Windows 10 becomes officially available.