Hi Arthur,
As per my reply to Drew re 30S vs 24D, I'd have to shoot the .177 and .22 30Ss back to back.
Without doing this, from recollection, both pretty much the same and, obviously, both very nice. Theoretically, there should be slightly less piston bounce / surge with the .22, but I would also guess that, with the smaller volumes and lesser pressures generated with the little 30, barely, if at all, noticeable?
I recently got my 15 year old daughter shooting. Now that she has finished her GCSEs, she has asked if we can do a little more shooting. I think a nice little testing session, with the two 30s and the 24D should be most enjoyable and informative. And these sweet shooting, easy cocking lightweights the ideal candidates.