I would disagree about 2 strokes being more fun than 4 strokes. 2 strokes may be more powerful for an engine of the same size, but 4 strokes come much bigger, and are more reliable. I've never seen a 2 stroke go anywhere near as fast as my lifan bike (68 mph), plus it looks cooler:
Heck, I'd wager mine would beat most mopeds in a race as well.
The only reason I'd ever go for a 2 stroke is that they're much cheaper.