My film preferences are as follows:
Kodak Tri-x 400, Plus X 125 and Ilford HP5 400 and FP4 125. Love both brands, can sub either emulsion if the other is not available and get great results. I have dabbled with Fomapan 200, it's nice and I have not got a handle on Fuji Neopan Acros 100 yet. I print on Kentmere and Ilford brand papers again, comfortable with either or.
I prefer Fuji E-6 in particular Provia 100, I really like how it looks. I messed around with some Kodak E-6 but never quite liked it the same as Fuji.
For C-41, it's pretty much an even tie between Kodak with Ektar 100 and Fuji, again love them both.