I like doing both, for the time being anyway. Of course, there will come a time when I run out of dumbells, and this would be inevitable for most lifters I guess.
They "feel" different, and it seems to me DB bench works more chest, or works it differently, or something.
Squat 160kg (352.7lbs), Bench 115kg (252.5lbs), Deadlift 220kg (485lbs)
Front Squat 130kg (286.6lbs), Strict Press 80kg (176.4lbs), Chinups +30kg (+66.1lbs)
My training log