T is tandem... the advantage is it is longer... thus smoother.... notice that a lot more T's have airbalanced elevators and most standards dont!
There is a little on my old website at
www.aeroforce.co.uk .... under Zivko Aeronautics.
The T i believe is the same weight and power ... long time sicne i looked though, this is only the story of my memory!
the T looks a lot nicer I agree... it looks more like an extra... i find the standards one has a cockpit area a little like the laser ... in turn not much bigger than that of a geebee!