I recently made this decision as well.
I needed something I could comfortably carry my Ruger Old Army for muzzleloading season. It had to be able to be worn on the outside with a coat and without. I had to be able to get to the pistol quickly and it had to be secure for hiking.
Eventually I deceded upon a cowboy style cartridge belt and holster. I thought about a cross-draw rig but that flopped around too much, the same with a drop down style belt. I thought about a shoulder holster but that looked like a pain to keep readjusting when donning/doffing a coat.
The one drawback, the pistol is on the same side as my rifle carrying shoulder - the right side. So banging the firearms into each other may be an issue when hiking.
Good luck with the CCW. I am going for mine in September.