First,I'm not going to recommend anything!I believe,given the choice,you can do a better job of picking your gun than I can.
Those 3 in 1911's look cute,and may work well for some,but folks I respect have told me the 1911's shorter than a Commander become less reliable.If you have 3 1911s,well,.maybe one can be a shorty,but If you will have just one,a Commander or Officer(shorter grip,6 rounds)might be good.
You are wise to shoot them till you find "the one".
I do not own a 9mm,but I'll say this.9 mm ammunition has become far more effective as bullet designs have improved.
And,if the point of your handgun is SD,there is a tradeoff between power and controllability....
Is BOOM...BOOM better than bam bam bam bam bam? I cannot answer that for you.
Does anybody shoot steel falling plates or other game near you?Go to a shoot.
Last,know when to say "Enough".I will not try to limit you,but we all have a point where we start hearing footsteps and getting squinty as we squeeze.
That's about the time we start missing a lot.
Have fun!Welcome