Bi-amping vs. bridging


Good day.  I am wondering what everyone thinks about bi-amping a dual port speaker vs. bridging the output on the amp to double the wattage.  I have a reasonably sweet Rotel 6 channel delivering 50 watts into all 6 channels (6 channels driven) but have the option of bridging the outputs and using a single teminal on the speakers.  I have a pair of Kef IQ5's, but will be taking delivery on some Martin Logan Motion 20's.  What do y'all think?  Best option?
128x128wisciman99
Thanks, aux.  I did use the bi-amping feature of the old Onkyo, and it sounded pretty nice, the problem is, I have Surround Backs, and that's the channel the amp uses for the second source.  The Marantz does not have a bi-amp setting that I can find in the setup anywhere (probably because it is only a pre/pro), hence the splitting of signals from there to the Rotel.  Does anyone know if the Front Height or High outputs are consistent with the Front Mains?  Or are they a portion of the signal based on the size/crossover settings?
More follow-up:  The Marantz does have bi-amping capabilities buried in the Amp Assign menu of the setup.  You must set it to 'SPKR-C'.  Unfortunately for me, anyway, it requires the use of the surround back channels.  Oh well.  Decisions, decisions. ;-)
Please excuse my posting frequency, but as you might guess I stick with stuff until the best solution is found.  From the FWIW column, the HL and HR are the solution for bi-amping, IF you realize that they are also tied to the Speaker B setting on the front of the pre/pro.  I selected A+B and viola`.  Thanks to all for your input and help.