I started with an 8ight buggy last season and bought an 8ight truggy for this season. WOW! Totally different animals. The buggy takes WAY more finesse to drive. You can drive the truggy much more aggressive than the buggy and get away with it. The truggy is much more forgiving handling-wise. The jury is still out on durability but so far, it's holding up quite well.
I'm still partial to the buggy because of the handling characteristics, but on a REALLY rough track, I enjoy the truggy more because it just handles the rough stuff so much better. On a decent track, the buggy is much more entertaining to me.