The TSL and TSL/SX are biasply, very aggressive but they lack in road manners. They flat spot from sitting, but it works out of the tire after warming up from a few minutes driving. The TSL Radial is slightly less aggressive but has much better road manners. Good handling and no flat-spotting.
The aggressive tires wear quicker onroad, so determine how much you want to spend and how often you want to replace your tires.
I've had the TSL radial and the TSL/SX. Road manners aren't as important to me as offroad traction, so I'm happier with the more aggressive TSL/SX I have now.