Best Stuffpack for CAS?

This is one of those things that is subjective to what your own style is and how you play the game. Fitness stuff is useless to me because I'm not into that style and nor do I play any Sims currently that those styles would suit. There is bound to be people out there that find that pack perfect for their needs though. Personally I'm loving the styles from Romantic Garden stuff and Laundry Day stuff the most at the moment for my adult sims, but I rarely find myself not using the Kids Room Stuff outfits for the children.

Alternatively, for Game Packs the winner for me is the Parenthood game pack because it just had a bit of everything for every life stage that I find myself using a fair bit. For expansions I really love the overall style that comes with Cats and Dogs.

I'd suggest having a look through all the trailers or posts on each stuff pack that contain images of each packs clothing and hair styles. Pick the one that suits your personal style and gameplay the most because at the end of the day, it's only your opinion that is going to matter :)