Why don't you try it with the gun you have and you can make a better educated decision from your experience.
FWIW I started shooting a Beretta 92. I went to a Glock 22. Then a HK USPc .40. Now back to the Glock. Thinking about giving my Sig P226 a try.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.