A late addition to the conversation, but may be useful for others searching later.
I test rode and LTa and TBc last week at Cwmcarn (thanks to Cadence in Bath). The TB was surprisingly capable, but the extra stability from the LT made it hilarious fun downhill and I could chuck it around at will. Uphill the LT was a bit wandery on steep little steps, whereas the TB would just shoot up anything.
Unfortunately I didn’t have time to test them in the twisty singletrack at home, but then I tend to ride my SS in that terrain anyway. From the sections I did ride the LT isn’t quite as keen to turn, but was certainly more nimble than my current Heckler – win win.
Overall, for me, the (small) advantage of the TB uphill couldn’t come close to the (huge) advantage and fun factor of the LT downhill. Horses for courses.