It all comes down to your reasons for buying a car - If it's for wanting help trackside pretty much wherever you go racing then a B4 has to win hands down PURELY down to the amount of people that run them (no offence to the RB-5 guys) but you can't argue that probably 90% of the 2wd cars you will see racing at just about any meeting will be B4's - So straight away you've got access to spares (even if there's no shop), set-up's and advice.
The RB-5 does look like a good car in the right hands, but there still just isn't many of them about and therefore even if spares are available from a shop it doesn't mean you'll be able to get them on the day unless there are others running the car that also happen to have a spare.... plus if there's nobody else with one (which can happen) you may find it hard to get the car right when all you want to do is drive the thing around and learn about off road.
I guess what i'm saying is that i think the RB-5 can be just as good and obviously suit some people more then the B4 does, but then the same goes with the B4 - Both cars are capable of doing well, it just depends how important it is to you that you can guarantee to get help trackside or not really?
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