I honestly think DUKE3D is better than either of them. The levels actually look like what they're supposed to be, instead of abstract corridors with nonsensical props strewn about, as in DOOM. It could also be my habits, but I also find the DUKE3D's movement is superior to QUAKE's. I always feel like I overshoot my target position in QUAKE.

Agreed about Duke3D movement being superior to Quake's. Not Doom (at least not for me personally), but I agree about Quake, which feels "artificial" -- no momentum.