Re: what sims 4 packs are the best and worst?

IMHO, this depends entirely on you and your personal play style and what you like to do in the Sims.

Are you a family player? you might want Parenthood. 

Do usually have a single very ambitious Sim who wants to crush his/her career?  You might like Get Famous.

Do you like weirdness and creating havoc?  Vampires and Realm of Magic.

That said, Seasons, Parenthood, and Tiny Living are among my personal favorites.  Discover University only does one thing, IMHO, but it does it very well.  If you like your Sims to be very good at everything I can recommend Get Together and Tiny Living. 

(I enjoy Island Living and Eco Lifestyle for off-the-grid and saving the world play. Okay, you can be off-the-grid anywhere, but I really like doing it in Sulani.)