I own a 25, a 28, and 4 33s. The 25 has the original chassis lenght, which means it has good turn radius.
As you get them progressibly longer the turning radius gets worst. A 33 class C can't do U turns.
As far as how confortable and the driving characteristics, it depends on the suspension improvements. The shorter ones don't ride too good, they are too bumpy. The 33s will let you feel the chassis flexing as you drive, and they will be more unstable at highway speeds.
I personally preffer the 28. Is long enough to give you a good ride, short enough that is not affected that much by the other vehicles on the road.
