I did a write up on the last site, 
Really depends on your driving style, 
I hade 35.5 and wanted the same size tire and more durability,
As long as you know what you are getting into you will not be disappointed,   I did not understand the difference between the two, so here it goes,
if you want the same carcus start with a large tire,  for example the Scats do not balloon up as much
- 35.5 STU to get the same size tire, started with a 39'' BFG,  
	 
- Larger the tire harder it is to get them to volcanize the paddle Stright mine are off center and not perfect up to 1'' off from left to right, 
	 
- shaving a tire down makes it thin, so they will slash on a rock or a nail same as a SU tire, or even thinner, 
	 
- Do to them being a steel belted tire,  they slide like crazy, if you like to slide more than a Funco then it works great, was scarry at over 70mph, always had to stay in the throttle letting off, or the car would rotate around 
	 
- Paddle selection is key, first time around i got the wrong scoop and every one of them tore off, and they where trashed on the first trip,  
	 
Ask about the Cure time,  the rubber needs to cure, i ran them the next day i picked them up and the paddle fell off, and some paddles are stronger than others, 
I did a HOOKER paddle and they did not last,  doing this again, everyone i know with a SUPERSCOOPER  seems not to have any issue, 
SkatTrak was great to work with, i just did not know enough about the paddles for my car,  Second time around was the key,   hope this info will help,
People talk about hard on the Trans,  I just dont see it,  i went aggressive on the paddle and it did not hook as much as a SU 35.5.    so i feel that is a myth.  I wanted the feeling of being in wet sand with the Skats, and it was less bite than my SandTiresUnlimited.    Hard to beat a SU Tire, but the price of them is getting scary,
Price of a SU tire is getting up there, hard not to go with a Vulcanized tire.