The big thing that the Suzuki has going for it is that it has fuel injection. No fooling around with jets every time you turn around.
But, I've got a YFZ 450, I really like the way that it handles, and it's got plenty of power for what I use it for. Then again, I've never rode a LTR 450 and only rode a TRX 450 once, for a little bit, but riding it was what made me decide that I needed to have a sport quad.