I used to have nothing but alpines and love them but they don't have as many features as other decks. You pay twice as much as other decks to have the same features. I swapped to a Kenwood and loved it. Then bought a pioneer and hated it. Then bought the 80prs and love it.
My favorite headunit company would have to be Kenwood. But I run an 80prs for the SQ features but do not like other pioneer decks.