Currently I have a B44 and it is a great buggy, a friend on mine has the Academy and likes it, and I used to have the Laxer zx5.
I like the B44 because I am an associated fan, but the Kyosho was great while I had it. My only gripe with the Lazer was that it was tight for the electronics under the body. My gripe with the B44 is saddle pack batteries.
Its all what brand you like the best, and which ever you LHS stocks the most parts for - unless you just have a reserve of parts.