From what Ive read, at most tracks Truggies and Buggies are about even as far as lap times go. But Ive heard even more that the popularity of truggies comes largely from them being more forgiving when pushing yourself hard (as well as other things like the new flavor of the week, etc). Though, it does seem they are slightly more prone to breakage due to their longer arms and bigger tires. In that Neo Buggy Invitational (the one where Adam Drake one, I think it was in the UK or something?), during the buggy race I don't think any of them broke, but in the Truggy race there were several breaks. The owner of my local track mentioned this to me when I was asking about truggies and buggies.