The best 9mm's for me from the best manufacturer:

Beretta Px4 Compact matched with the
Beretta Cx4 Storm with Px4 magazine well adaptor

I could have listed the 92FS/Cx4 but prefer the Px4 due to low recoil. I believe these pistol/carbine combos maximize the potential of the 9mm and help develop practical shooting skills.

Although I admire the design & internals, I find Glocks uncomfortable to shoot. I regard "Glock knuckle" as a deal breaker rather that an idiosyncrasy; plus Glock does not manufacture a 9mm carbine to match the pistols.

Now a 9mm carbine that uses Colt magazines coupled with a Colt pistol utilizing same, tweaks my interest.