Depends on what you want....
B4 - Build as kit but, change springs and put right tyres on and you have a competative car. Great if you just want to put batteries in and race!
RB5 - Need to work more on the setup, but if you enjoy that kind of thing its very rewarding.
In my opinion (having raced B4's for 4 years and RB5 for 2 weeks!) the B4 is a stronger car, the latest FT version also requires very few hop-ups, maybe some castor blocks etc.
RB5 is a smoother more neatral handling car when you get it set-up right and its nice to run something a bit different. Also it needs a few more hop-ups, must haves are titanium turnbuckle set and carbide diff balls.
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