This is an easy question...

The Omega....

and a flinter.

Seriously, my rifled shotgun barrel has not even been mounted in 3 years. I used to carry my 11-87 for close shots (open sights) and my Omega for long range 150-300+. Twice in several years that combo came in handy. Then I bought a second Omega (X7) and the shotgun hasn't been out since.

If I owned a flinter, I'd want that out there instead of a second Omega.