If you can, try to test drive an Evora S (equivalent to Touring) and a GT410 Sport (equivalent to Sports). If your local dealer can't help then see if any of the MLOC owners can.
If you can't do that, then take the advice of the ride and handling team. Touring is for fast road driving on mixed surfaces (including day to day, long distance and spirited cross-country) and will be perfectly capable on track. Sports is stiffer for a more enhanced feel and is more track-focused but has the minor downside of a slightly harsher ride on poorer surfaces. And for some "enhanced feel" is too much feedback depending on what they've driven before.
The differences between them are far smaller than between Elise Touring and Exige Sports.