Recoil wise I couldn't tell much of a difference. They're both small guns, so its a little zippier than in a full size pistol, but no big deal. I went with the G26 because I already had nines and the mags are interchangeable. Add this to the fact that 9mm is cheaper than .40 and it was a no brainer. If I were starting from scratch, I probably would have bought the G30 in .45. .40 always struck me as a somewhat silly compromise caliber. Not tht much better than 9mm, and not near the oomph of a .45. Nothing wrong with it, it just doesn't seem worth the extra ammo cost. Your mileage may vary.
FQ13