Indoors the B3 is very competitive, however, I would say the B4 is lots more stable on bumpy/rutted tracks, after driving both.
The B4 is more of a 'clubmans car', and is generally the more stable of the two. If you went down the route of the B4, you could eventually move to the X-Factory X6 should you wish, which is becoming a very popular car ATM.
You might find getting hold of some B3 parts could be more difficult now.
Hope this helps a bit.
Mark
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