Jim's description is spot on.
I used to run a B4 but since my switch to RB5 I have picked up not a tenth of a second but over a full second per lap ... as has everybody I know who has switched!!!
The B4 is a good car but requires a particular driving style .. if you don't drive that way the car will be a handful.
The RB5 is very neutral out of the box and can be tuned to be almost whatever you want it to be!!!!
No question in my mind, RB5 all the way!!!
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