A .30-30 Contender isn't for everyone, and certainly not for everything, but the Contender's strong suit (besides accuracy) is versatility.
I have a Contender, and barrels in .22LR, .22 Hornet, .222Rem, .30-30Win, 9mm Luger, .357Mag, .44 Mag, .45Colt/.410, .45Win Mag and .45-70.
I "wasted" over 30 years not bothering to look at the Contender, because it was "only" a single shot. Then, one day, in a shop, just for snits and giggles, I was handling a Contender, and found it had a really good trigger pull. I didn't get that one, but I did decide I was going to have one of those!
Single aimed shots. That's what it's about. Not pocket carry, or speed of followup. Just accuracy, usually on a level not matched by repeating handguns.
Mass market 9mm vs Contender? Contender, absolutely, as long as you have something else to cover personal defense at need.