Help needed with starting out on off road

[yorkie]

Hi all. My grandson and I would like to move from electric on road scale 10 touring cars to electric Buggy scale 10 off road, preferably on external track of tarmac/concrete/astro turf/grass etc, my questions are should we look at the B4 as has been sugested at a meeting I have recently been to. is there more chances to race with 2 or 4 wheel drive vehicles, we have most of the electrical and control equipment which includes 10.5 motors would we be able to use them, If we go for the B4 could we use our existing Lipos.
we don't want to find we get 2 wheel drive vehickles and find we are penalised as to how often we can race All help would be appreciated
regards Yorkie