I carry a CRKT full size Tanto folder, but What I learned after I bought it, is that the blade is not ground evenly, it's one-sided. It's great other than that, but I think I'll be getting a full-size Spyderco with 1/2 serrations.
Look at it this way. You want to have your gun, but you will need a knife many more times in life than you will need a gun. You can take a knife many places you can't take a gun. If we carry guns because bad things happen in life, your gun could be non-functioning or be lost, and you would need a backup. There is a lot to carrying a knife defensively, and one example that comes to mind is keeping it in case you are fighting to RETAIN your pistol and need to use it.