I'd have to say the best 9mm firearm is the MP5 Navy. Have fun coughing up the ~$15k
for one in addition to the paperwork, background check, and about 6 months waiting for the transfer to go through. :chuckles:

Assuming you mean pistols in 9x19mm Parabellum, you'll have to find a range that rents them for use on their range and try them. A Glock 17 feels totally different from a Beretta 92F, but you'll find plenty of people claiming either to be the "best." The same goes for many, many others.

I really enjoy my CZ-83 in 9x17mm (9mm Kurz, 9mm Browning, .380 Automatic, it's all the same.)