T6 is a Stadium Truck racing kit and has a aluminum chassis stock with a carbon chassis as an option. How 'fast" it is depends on skill, setup and electronics used. the latest version is the T6.4 which was released a few months back.
The LT10 SW is based on older designs and in an entry level kit. It's the wheelbase of a buggy, not a stadium truck.
They aren't in the same class. LT10 SW would be considered a Short Course (full body) truck while the T6 is a Stadium truck (open wheel) and all the modern stuff is mid motor now.
The LT10 SW would be great for a spec class of them though.