Which Sims 4 traits are actually worth picking?

depends what the sim is for, but for a normal legacy-style save i keep coming back to ambitious, creative and cheerful. ambitious gets you through careers quicker, creative keeps a painter or writer inspired most of the time, and cheerful just means fewer sad moodlets to babysit. the ones i avoid unless it's for a story are lazy, clumsy and hot-headed - they mostly add chores. also don't sleep on the aspiration reward traits, a couple of those do more for gameplay than any trait you pick in cas.