At least this debate isn't PC vs MAC (R22 vs 300CBi)... that conversation is getting old. I have to agree with the folks above, your answer will likely depend on what your future intensions are. If it is for personal use and fun... I'd learn on the B47 first (that's just my opinion). If you are thinking about a possible career in the future... I'd learn on the R22 first because it is likely you will need to build time by teaching for a while. Regardless, pick one type that is convenient and economical for your location and stay with that until you've completed your PPL. After about 20-30 hours of private flying, start looking and learning on other types (just for the experience).