What is its purpose?
You've picked a fullsize 9mm and a .22 plinker those fit vastly different rolls.
The purpose, to add to my collection of guns I'm not sure to be honest, something I can take to the range and have fun with, but use it defensively I suppose?
OK... Since you made the comment, Ill be the first... you arent seriously considering using a 22 for defense, are you? Bad idea. Just sayin...
How much 22 ammo do you have? It is not as easy to find as 9mm. If you have plenty I love my sr22 so do my kids and their girlfriends. It is a nice pistol to train a non shooter on.