125 all the way for fun factor
i love the challenge of trying to carry as much speed as possible on my 125, i love how flickable easy to put anywhere you want it, it is. i never stop smiling when i ride it, it's hard to explain
i love 250's as well but they're a handful for me, they can get you out of trouble just as fast as they can get you into trouble. If i were to own one again i would put a flywheel weight on it, to smoothen it out a bit, they're amazing machines
i think having one of each would be perfect, the 125 teaches you great technique/how to charge into every obstacle, and then when jumping on a 250 you use the same concepts as a 125 and it improves your riding exponentially. I am quite a bit faster on a 125 than i am on our 250. But i haven't ridden the 250 in a while, and i'd bet money that getting on the 250 i would be even faster than i am now, purely bc of the power increase of the 250 allows me to do more things than on the 125.