Not an expert by any means here. I wouldn't talk anyone out of buying something new ( unless it is a 270). But yes the 40 is a little more snappy, but not bad, in my opinion. My 40 is a Glock 27. I tend to use 165 or 180 grain loads, in seems with those there is less muzzle flip.
I don't know about Smiths and XDs, but with Glock you can get a 357 Sig barrel a 9mm conversion barrel and someone is making a 22 TCM barrel also (with a shorter bullet to fit the mag length).
The last time there was an ammo shortage, the 9's flew off the shelf first, then 45's, then 40's and lastly the 357 sig. If that means anything.
