The 9.22 has gone through a few changes since coming to the market in 1997. The one constant has been the shape. I used the 9.22 for the 1st few years, but then switched to the 10.20 once they became available and then the 11.20. As the higher performing 9.20, 10.20 and 11.20 were developed, the 9.22 has been tweaked to fit at the easier-to-ski end of the advanced midfats. The 9.22 has been the biggest selling midfat in the Atomic line for a reason. It works very well.
The Ride 9.20 has also gone through a few changes. The original grey with burgundy lettering shared the same shape and core as the 10.20 of the same year, but without the titanium profile top skin. The 2000/2001 Ride 9.20 had a revised 'V' shape, whereby the tail did not flare out as much proportionately as most other ride series skis. Also, the waist was reduced to 66mm, making it a wider regular width ski, or a very narrow midfat. The advantage to the V-shape was that the ski intitiated very well, but could be skidded at the release of the turn, or finish more aggressively like a race ski. The 9.20 skied nicely, but didn't do anything special.
Either ski is good, and both should be tried before you put your money down. Next years 9.22 has been changed again, and it does perform with a bit more zing than the last couple variations.