More than a few of us opt for the .327 Federal Magnum to have the 20% more ammunition capacity advantage. Might not mean anything to most but means something for some. Too, being able to use almost all .32 caliber ammunition is a plus for some of us.
20% is a fancy way of .327 fanboys to say it holds one more round. I understand that, I appreciate being able to have a true 6 shooter in a snub nose J frame size revolver.
I don't think anyone can go wrong buying either a 9mm or .327 LCR, I think they're both superior and more logical than the .357 LCR, but I took a step back from .327 after I got my SP101 and really thought about it vs 9mm. .327 in the SP101 can be stout, so in an LCR it'd be even more so and Idk if I'd really carry any .327 in it over .32 H&R Mag. I don't think I would, but the benefit of .327 over .32 H&R is you always have the extra power option.
Thing is you have power options in 9mm too. You can use light loads from Hornady, or the +P+ stuff or that new +M ammo we saw debuted at SHOT show earlier this year. That's all thanks to 9mm being the most popular centerfire cartridge in the world.
So, between the two the only loss I see going with 9mm over .327 is 5 rds vs 6 rds, but there are a lot of factors at play. One thing I do know is that with the 9mm LCR, I'm going to shoot that more than I am the .327 LCR, so I'll enjoy it more and become more proficient with it. The likelihood of me having to use either for defense is very low, having to shoot it more than 5 times even lower.
I've reached a point where I'm tired of paying $100 or more for some feature of a gun that's mostly just a talking point.