Hi there,
I find the RRR to be easier to set up. Frankly, it's easy to set up the RRR to handle like the FW05R, just stand the shocks up and they would feel similar. Of course, the RRR cannot roll around the corner like the shaft car can but like you said, it can get in and out much faster.
I have both cars and I find myself driving the RRR much more often. It's just less sensitive to traction changes and faster for me 80% of the time. If I have to choose between the two I will go with the RRR. I know I will miss the FW sometimes especially when traction is high but when traction is low the FW is just not competitive (or I couldn't get it to work right).
Hope this helps.