I have always thought doubles were nifty.
I have:
William Evans 400-360
Kodiak 58 cal muzzle loader
Kodial 54 cal muzzle loader
Once owned a 50 cal CVA double
All SxS

I have hunted deer with the Kodiak 54. Breech loading rifles are not legal for deer here in Iowa.

I have several SxS shotguns in 12 and 28 gauge. I hunt pheasant with them. Gave up on using them on rabbits, they are two destructive on rabbits.

I have three bolt action rifles and one lever action rifle.

A double rifle MUST NOT have an auto safety (An auto safety is a serious health hazard in a heavy stopping rifle.) and MUST have two triggers. It should not have ejectors. It should be chambered for a rimmed cartridge although the choice of rimmed cartridges is a bit limited.

My preferences in a shotgun are the same, although an auto safety and ejectors are tolerable.