I had an older KTM200, but have been around the newer ones. The KTM200 is 125 based, so its smaller and lighter. It also has a more nervous feel, and PDS is well, PDS. As far as it has come, any shortcommings seem to be more noticable on the lighter bikes. I don't know about the new KTM200s, but mine and others had a terrible vibration for a small bore motor.
The GG200s I've experienced were more like tame 250s. 250 based, its heavier, but feels lighter. Same reason why a 300 feels heavier than a 250, power. Less active and nervous than the KTM, more planted. Feels slower, but a lot of this may be perceived.