Both are great, but with today's slug performance there is just no need to subject yourself to the 12ga recoil, today's 20ga will do the job better without recoil which in return will help you with accuracy. I have the 220f, she is topped off with a Leupold VX-II 3-9x40 with medium Grim Reaper one piece mounts and I'm using Remington Accu-Tip 3" shells, and at 100 yards I'm 4" above center with a 5 shot group measuring 3/4", I just love this gun and set up.

Good Luck!!!!!!!!!!