There are so many to choose from. There has never been a better time in history to go shopping for a 9mm pistol.
I have been a Glock guy since 1990, so I am somewhat wedded to the Austrian plastic because I am so familiar with it. I shoot a G19 and G17 better than any other 9mm.
But if I was starting out today fresh...
For striker fired pistols I would look strongly at:
S&W M&P, Glock 19 and 17, Ruger SR9 and SR9C
For SA/DA pistols I would look strongly at:
Berreta 92-type variants, Sig P226/229, Sig SP2022, CZ-75 variants
For a SA pistol, the only option in my opinion is the Browning HP...