i like my kenwood a lot. alpine is alright, but im not that into it. I despise Sony (even though I love it for home theater).
I like Pioneer’s audio controls, esp the sub controls. my only beef with them was maybe 4 years ago, when you play mp3 cd’s, there was a delay when you switch tracks, ff or rewind. but i believe they have gotten rid of that
I will probably go either kenwood or pioneer for my next car
btw- you left out clarion. I’ve never had one so I can’t comment, but I’ve heard good things