Good Job , you have narrowed it down to the two best race quality stadium trucks . It all comes down to personal preference , I`m a Losi fan and got a B4 in a trade and like it better then my XXX-cr on certain parts of the track and still undecided which one I`m going to stick to . I do not like the T-4 and run Losi for truck . Check out what your hobby shop and the shop at the track mainly carry parts for . My track there is 95% AE guys and sometimes it`s hard to get Losi parts at the track`s shop.