Gryffindor: deliberately kills their sim or ruins their life for drama, gives their sim an awesome career, buys pre existing houses

Ravenclaw: spends ages designing their sim to perfection, buys empty lots and uses cheats to get enough money to build manually, tries to act out storylines with sims and is frustrated when they don't listen

Hufflepuff: uses generic sim face and body designs but plans their outfits, actually tries to send sim to work at the appropriate times, gets genuinely upset when a sim's relationship with someone goes down

Slytherin: buys an empty lot and uses the motherlode cheat to get enough money to buy the rooms they want in build mode, tries to max out every skill, aspiration, and career