a buddy has a 04 kx250f, with all the procircuit upgrades and it rips:beer: you dont notice the weight with all that power, personnaly i like 4 strokes a little more
both are very dangerous machines, but you can ride safe and still be hardcore on both, personnaly i think dirtbikes are safer and more fun lol, id rather bail on a bike than a quad, cause the weight difference is substantial