What is your favorite kind of beer? It makes more sense to look at the kits with an eye for what kind of beer you like rather than ask my favorite kit. Heck, you don't know but what I only like beers that have 2% alcohol or less. Give some hints of what you like and let us take it from there.
BTW, since I've started brewing my own, I've developed a taste for cream ale.....and Irish red....and robust porter......and spiced stout.....and.....