Its a matter of personal preference...
If i had to guess i would say TBT and R.C tech. I would say banana tech if you asked last year but its obvious Lib see's the double camber of R.C tech as being superior possibly or they wouldnt be making their new boards with Double Banana(C2 i think?) technology in 2010...
Variogrip and Magnatraction are different implementations of the same thing. Some say magnatraction is too grippy, some say its not...
A lot of people also like the scoop design of TBT, as its more difficult to catch edges..TBT would probably be your best bet if your big into ground tricks or rails. To me it seems like it could get squirrly on landing jumps but i have no first hand experience.
'09 151 Never Summer SL-R
'10 K2 T1 DB Bots
'09 Burton Cartel Bindings