Well it certainly boils down to individual taste.
Years ago when I rode bikes in my youth it was the DR/XR200s/250s of the mid eighties.
A few years back I erred toward a KDX200 (through talking to an experienced KTM200 rider) as all the qualities fitted the bill, ie great trail bike.

I found the bike to be everything it was cracked up to be, reliable, great engine (broad power) and low maintenance.

I have also ridden a mates RMX250 and found that to be very similar but engine wise it had more all over, most noticeble being the stronger midrange hit.

On one ride I also tried out a YZF250 and found it to be my least favourite for the trail.

The great thing about 2 strokes for me (coming originally from 4 strokes) was that certain 2Ts can do everything a 4T can do (minus engine braking) as well as giving you that 2T grin/buzz that no 4T will ever do.

One day I will take a 125 for a blat, and if I like it it may well be my next bike...