I might be able to help some since I have owned both a GG and a KTM. To start you can't really go wrong with either bike but for myself I have found the GG to be a better bike and more fun. (Remember I am a girl)
The 2001 Gas Gas now has a bigger tank than the it did in 2000 by about .4 gallons. Visually you can't see a difference but they just pushed the tank into as many more places as they could. I currently own a GG 2001 250 XC and a GG 2000 200 EC. Both are great but I just LOVE the 250!!! Can't stop smiling
. I get about the same gas range as the KTM when my jetting is right even though everyone thinks my tank is smaller. I definitely like the suspension on the GG better by FAR!! One interesting fact that both my husband and I have found about the GG is that it is easier to ride standing up that the KTM. The KTM seemed to want to dive in and slide out in turns if you were standing where as the GG just holds a perfect line and you don't feel as if you are going to crash. You might wonder why I stand up in a turn but if you want any of the top riders like Lafferty, Hawkins, Davis, you will see that they too do more riding standing up that sitting down. Once I learned this technique I was a lot faster.
Reliability would have to be about the same. I smashed my radiator on my GG at the Nation Enduro in Phoenix on the A loop when the bike tipped over and landed on a rock that was sticking out just right and it cost me $ 178.00 to replace. 2 Weeks later a friend smashed his radiator on his KTM and it cost $240.00 and was not in stock at the time. I ride hard and at least 4 times a week plus race the Rocky Mountain Enduro Circuit and I have had no other problems with either bike. Things will happen and that is just the way it is. If you were in Colorado you could ride mine.
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Nicole
GAS GAS 250
GAS GAS 280 Trails