I've played most of the premade households. Any sim I know I'll have no interest in gets promptly deleted with their house occupied by one of my own sims.
There are a few premades I play with way less than others, which would be the Roomies (minus Zoe Patel), the Bros (?? - the house with Joaquin and Sergio), Goths, Rasoja (?? - Raj and Geeta from City living). The Munch fam used to be part of this list until I had Gunther get married to Maaike from the Free Spirits household. Now I have an ongoing story for them.
I feel like I'm forgetting a premade house or two but that just goes to show how forgettable they are for me.