The F7 is a right hand pipe where the toomy is a left hand pipe. On a heavily built blaster (big bore, P&P, big carb, ect...) a right hander is usually the way to go although I've heard good things about the fat basterd pipe from vitos I've never had the chance to try one, If your bike is only lightly modded the toomy would be great. When it comes right down to it, its all about your riding style. call the company and ask them what rpm range the pipe is built for and then ask yourself what rpm range are you going to be riding in most of the time, that way you can find a pipe that works best for you.
As far as right hand pipes go they are pretty much all the same pipe made by POWER PROS. LRD, F7, Phantom, and I think Dyno port (dont Quote me on that last one)are all the same pipe with different badges welded on them. although LRD does offer 2 versions of there pipe one is the same as the other pipes and one has an adjustable expansion chamber