Ok first of all, being at the top of the power on a 4 stroke and 2 stroke is a whole different universe. Four strokes can simply be taken a gear lower. You shift when you feel like it and use the clutch in rare instances during a race.
Secondly, I agree about people here sometimes getting a little excited about the 2 v. 4 argument. We're all guilty, myself included. But at the end of the day, when you look at the big picture, todays definition of the four stroke motocross bike has NO place on a motocross track. Lets assume for a moment that you have a blank cheque for all your bikes. That takes costs out of the equation. And lets also assume that motocross around the world had the ridiculous rule of double displacement revoked. if its a 250, it gets run in the 250 class. Diesal, rotary, two stroke, four stroke, irrelevant.
What would you choose motoman? Would you choose the bike that didn't advance your skills very well, made you a lazy rider, wasn't as much fun to ride as its counterpart, harder to start (KTMs four strokes excluded here of course), made an obnoxious sound that carried a very long way, was heavier and slower?
having more torque is what a 4t has over the 2ts. top end power is still TOP END. and i do think the running 250 vs 250 is a valid option. its already being show cased at the amateur nationals
what would i choose to ride? something like a KTM 200sx honestly. it way more power than a 125 and didnt get me into trouble like a 250 and i can swap a top end in 30min. but oil changes/filters/ gas is all the same( i was walked through doing a 4t top end once). however the 2013 KXF250 looks pretty nice. 41hp how much does a yz250 put out? like 45? i remember MXA testing RV2's '08 KX250F saying it put down 46hp. that was almost 6yrs ago. 6 yrs ago the stock 250f's put out 37hp. yes these are heavier but slower? ive seen more ppl go faster on one of these than any other bike. and any bike ive ridden took all my focus and efforts i could simply relax more on a 250f. but as far as being lazy on one. If i raced lazy on one i didnt do well. its only when i charged hard