This is a constant debate on many Toyota based internet forums. Both are great quality products and both are virtually identical. Visit
www.ttora.com and do some research on their forums to get your answers there are more threads about this discussion around the net than you want to find.
www.tundrasolutions.com also has many although I think their forum is a pay forum now. Something else I would do years ago when comparing systems that are very much identical in parts is call some neutral parties. Get some feedback from people who run both. Call some offroad shops that install their parts and see what they have to say. This probably isnt the answer you want but usually threads like this turn into a bash-a-thon and both companies provide great products for the Toyota community and I am personally tired of hearing this debate online.
Not many people running either on FJ's yet so your best bet is Tacoma forums.
Good luck