Both.If racing and lap times were my concern,I'd have a 250f.I loved my XR and Berg and in many place,they were better than my 2 strokes-in many places they weren't.I have more fun on two strokes though and that's what it's all about for me these days.
Interestingly,I always loved the boom of an off road fourstroke-when they were somewhat of an oddity.Now that they're everywhere,not as much.