My $0.02:
Marlins are easy to field strip so you can clean from the breech.
Winchester 1886, 92, and 94s are a pain to take down. In particular, my Interarms 65 (Rossi 92) is a bitch to get back together. Unless the action gets full of gunk just clean the bore from the muzzle and use a muzzle guide. If I ever want to clean the action on the 65 again I'll just remove the buttstock, open the action, and hose it out with brake cleaner then relive.
The earlier toggle-locked rifles (1860 Henry, 1866 Yellowboy, 1873, and 1876) are easy to take apart unless you have a modern Uberti with over-torqued screws. However, doing so is generally unnecessary.
If you're shooting smokeless you can clean the bore fine with just a boresnake, unless you have serious metal fouling.
I mostly shoot black powder .44-40 and .38-40 in my rifles. The brass is thin and seals the chamber so that no fouling gets back into the action. E.g., I've put 100 BP .44 WCFs through my 1860 Henry in one session and the action was perfectly clean. If you shoot BP in cartridges with thicker brass (e.g., .38 Special, .357 Mag, .44 Special or Mag, or .45 Colt) you'll probably get BP fouling the action because they don't seal as well.