I'm an amateur builder for both TS4 and TS3 (and Sims Bustin' Out, but we don't talk about that). I prefer building in TS4. It's cleaner, and I can replicate my vision better than in TS3. Being able to minimize/maximize items and being able to lower or raise items helps make my buildings homes. I know there are mixed feelings around clutter, but clutter really helps give rooms character. Tiny spaces feel lived in while bigger mansions don't feel as empty as they do in TS3.
I will say roofing is a nightmare, regardless.
