Just my opinion on the bikes mates own from the short riding I've done on them. Keep in mind that I am a 100kg slob.
KTM125sx (2T) with 145 big bore kit. I found to be super flat before the pipe as you would expect from a 125, this made technical slow riding a real issue for me because getting the torque required engine speed which results in wheel speed (short of some hefty clutch work) and then breaking traction made life difficult. Great for ripping around flat out or trail riding, but not ideal for trials type riding.
The YZF250 (4T) was actually really comfortable, and I felt like I could climb Hills easily on it as it has good torque (esp compared to the 2T). But the seating position felt very flat and it was rather fussy to start as it's the model previous to having an automated decompression valve. I would recommend it as a good bike for a beginner whose looking for a 4T as you won't grow out of it in a few rides.
KLX450, Torque monster & heavier. As all 450s tend to be, the upside, who cares about what gear you are in, the torque will sort it out.
300exc (2T)the bike I rode prior to buying my one, it was an 07 model, nice electric start and fitted with a centrifugal style clutch which took no time to get used to and was magic during technical tough stuff as you couldn't stall. I missed it the most getting off the bike.
RM125 (2T) my best man bought one and loves it, but regrets not getting a 250 2T ($budget$). We do slower technical riding and being the same size as me he also struggles with torque. That said when the rear shock blew out at a trail ride I swapped him for the day (trying to convince him to spend more$$) and he followed me while I went pogo pogo all around the forest on his bike. Momentum is the key on the 125s.
Tapped out on the phone in the hammock drinking beers so don't believe everything but just a couple of my observations.
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