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The RB will throw more weight to the front of the car (up to 200lbs by some sources). The effect of this is debatable. Two the things the 240 has going for it are very good weight distribution and the light weight. How much that will be affected, I can't say, but it is on some people's minds. An RB be a much smoother than an SR, though, since you've got more cylinders firing per rotation. The stroke of the RB25 is shorter, too, at 71.6mm as opposed to 86mm for the SR.
I apologize if I'm being redundant, but you really need to decide what your intentions for the car are before the answer to this question will present itself. The amount of headache you're willing to suffer to source parts is something you should think about as well.
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