Here is my take on both...
TBT makes snowboarding even more fun. Better carving going edge-to-edge, more stable on landings (huge plus when pulling sketchy spins), does fine on ice (not great), flat land tricks = awesome, and of course riding flat to speed connector trails.
Magne-Traction I have not personally rode but can safely assume there are no real big 'negatives', it really just helps the board carve on ice.
Mix Magne-Traction with Banana Tech, BTX, which i'll assume you meant as well adds pluses of the rocker design. There is enough on bananas around here that a quick search should solve your problem.
09 Bataleon Evil Twin 155
08 Burton Cartels
08 DC Super Park BOA's
12+ years riding a plank down snow
Bataleon Evil Twin Review:
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