I love the power hit, pull, revs, and sound of a two stroke.  Two stroke are simple and cheaper to maintain than a 4 stroke, but 4 strokes dont need to have the top end rebuilt as often. 4 strokes are cleaner.   My perfect quad would be a lt500 motor in a well suspended modern day quad with dare I say..electric start and reverse.....  my zilla is easy to start but I must say it is enjoyable to hit the electric start button on the raptor.   I still prefer a a big two stroke.