The most original 40S&W on the marketplace was the Glock.....partially from the number of Departments changing to them ....and the number of KB's of Glock 40's.
When Customs and Border Patrol...now ICE went to 40's...they went with the Beretta.
California Highway went to 40S&W and went with the S&W's
Today LEO's going 40S&W tend to go more toward the S&W M&P like the Colorado Highway Patrol and Division of Wildlife....and the barrels don't blow up like they did in their Glock range testing.
And the Springfield XD/XDM is ofter the choice as police chiefs like the fact it is locked open with the mag out to disassemble it...WITHOUT having to pull the trigger like on a Glock. The barrels are also heat treated and don't fail.
40S&W is a better SD round than 9mm and in most cases fits more hands than pistols chambered for 45acp.
My best guess is that NO pistol is the standout as a 40S&W.