Just to throw my tupence into the jar.....
I have always owned an Ae touring car (until 2005 when I got an RDX, now I have a T2) and I love them. Based upon the performance of the losi touring cars is how I chose my buggy, which received a thrashing in my first very buggy meeting. So I bought a B4, purely because I hadn't ever been 'impressed' with losi in TC.
I found the B4 to suit my driving well, and was easy enough to get going fairly fast, aside from my inexperience. I won my first buggy B final (all be it out of 3 buggies, and a Nikko Monster truck
) and I am loving the B4 at the minute.