Good Morning,

While there are pros and cons to both. Theres more bang for your buck with 5t's. But theres a fuller range with the 6b. I think ultimatly both are very nice, and your defining factor is going to be space. The 5/6t's are quite large, and WAF is very small. Wheras the 6b packs a huge punch in a very nice small ish package. 

Im sure the Aperion GURUS can give you the technical details on teh difference. Thats my .02