I own both pistol and they are excellent. The 5.7 is an amazing gun, really light and will make you feel like a marksman since it is so easy to shoot. 20 rnd in a mag, make for a lot of firepower in your hand. I was converted to it by a friend who carry a 5.7 as a truck driver in the middle east. His company only allowed one hand gun with 2 mags: one of his buddy was carrying a 1911 and run out of ammo in an ambush waiting for the army to rescue them, he was able to shoot (in the air) but kept the bad guys at bay.

5.7 is a perfect round for home defense, since it will kill the bad guy (tumbling bullet make for horrendous channel wound) but not go through your house drywall killing your kids in the other room....

Please don't listen to the BS about 5.7: This is a great round and the fn 5.7 is a great gun.