I'm a newbie to this tracked UTV thing, but was told by a few people using them, that a external drive track like Matt track and TJD are superior for running in mud and sticks because they are not as prone to "ratcheting" as the internal drives like Tatou. I looked at a Matt Track on a 650 and it looked like a power robbing beast and was told they were more for a pickup than an UTV. I really believe the Tatou is the best out there, but my running will be in serious swamps and tundra and I was afraid of the ratcheting problem, so I went with the 121" widetrack(12") TJD. I've got a temporary old style TJD that is around 100" and it seems to do well. It's only 11" wide.