Personally, I love the vortex, and especially on an M14, but it's very long, as is the brake. Out of the two, I'd take the vortex, as it has a 'brake' function on recoil too, but really, you're adding a fair bit of length with those long muzzle attachments. For a shorty, a mini-30 intended A2 style flash hider is a nice touch, keeping the length down.
But then again, a vortex looks mighty cool, but as I said I've only had them on full length M14s...