The SR22 should be the better choice in this instance. The Mosquito can be finicky, if one isn't accustomed to maintaining a firearm. I've had several over the years (and still have my first 'Sport' version). Initially I experienced all the bad things Mosquitoes are accused of (FTF, FTE, etc.). Fortunately I found the Sig Forum and all the posts/tips/tricks assembled by Mississippi Dave. Basically it boils down to "keep it clean and shoot it 'wet' (meaning well lubricated)." All my problems disappeared. I've put several through the regime I followed and the results were the same. I have at least a dozen .22LR handguns and the wife prefers the Sig. Mine shoots virtually anything I put through it (just use the right spring). Yes, my Rugers, MkII 22/45 and MkIII Hunter, are more accurate and work flawlessly but the Skeeter is the 'plinker' of choice in our household. I know several with the SR22 and they love 'em. I'd be tempted to add one to the battery but I'm presently coveting one of the dedicated .22LR 1911s, like the GSG, so I'll just continue saving up for that.