450 4T vs 250 2T

Hey guys what's the power difference between these two? Is the 450 4T way more powerful than a 250 2T? I'm looking to get into MX and trying to buy a bike.... I've seen some 450 4T's pop up but am hesitant to buy if it has much more balls than a 250 2T. I've only rode a KX 250 before and I tried my friends CR500 on our street and that was way too much balls for me. So if a 450 4T is anywhere near that of the CR500 then I don't think I will be looking at those lol.
 
450 4 stroke= power house and loads of grunt!
250 2 stroke= zippy flickable!

Track riding I would take the 2T on, (I don't do trCk in my old age).
Desert long distance trips the 4T, shorter rides 2T.
Mountain, single track/50" fire road, either.
Woods, single track, 2T
Nothing but a CR 500 is like a CR500.
 
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