Im much more partial to a big curvy booty, however I have more than a sound appreciation for a nice cute little butt. That way you can see the pussy spread from behind
I had one really big booty one time and it's kinda mesmerizing to hear them slap your abs as you pound them deep. I love all butts, as long as they're not skinny boned.
My wife has a small tight butt, but I do prefer huge round booties. I do wish her ass was much bigger - like the girl in this pic. But of course, my cock would be way too small to fuck such an amazingly big booty.