Well the 45c will hold even less than the FN unless you use the 10rd mag in the "C". The flush fitting standard mag in the 45c holds 8.
I do not have the C but I do have the full size, I love the gun but if I wanted something smaller for carry I'd probably split the difference and get. Glock 30S. But if I wanted a hammer fired pistol I would get the 45c in the V1 Light LEM.
If we're not talking about carry, I might be persuaded to go the FN route, but it is a pretty big chunk of gun.