I have used ping most of my career but I got curious and rented the RBZ yesterday. They are cheaper than the G20 and comes two levels earlier so I somehow assumed that the G20 was somewhat sharper but my impression after a few rounds with the RBZ is that they are quite a lot better. They need to be dinged, that's for sure, the half dot of forgiveness is really noticeable. On the other hand - I seem to ding them more often. Don't ask me why, coz meter speed is higher...
So, according to my experience:
Predictability: RBZ wins by a mile. Mostly due to distance predictability. The G20, specially with the Nike balls, behave really weird when you put a lot of backspin on it and since they don't bite well, you need backspin.
Round to: RBZ
Precision: To be honest, I never felt the G20 lack in precision, if I ding, they seem to fly at the path that is to be expected. Apart from the distance (see above). However - the RBZ stops where you want them to. Very noticeable on the long irons and elevated greens.
Round to: RBZ
Scaling: I find it odd that the RBZ's PW is 125 yards. after that there is 135 & 145, only 10 yds in between. I guess it is good if you carry 3 wedges but the longest iron is 220, not really enough for me to feel comfortable leaving the rescue at home.
Sure, the 220 is better than the 215 G20, but the 110 yds PW in the G20 set is short enough to go with 2 wedges and the rescue.
Dilemma here.
60-80-125-135-145-160 is a weird stepping.
Round to: G20
Meter: RBZ is faster, but I dont notice any difference really.
Round to: Tie
Does anyone have anything to say in G20's defence? Something that can convince me I could as well stay with the G20 :)