What sort of shooting do you have in mind, should you buy a lever gun? That might be helpful in narrowing down choices. For casual plinking, a Rossi will suit your needs. These have been hard to find lately, but do appear from time to time. Rossi rifles can be slicked up to run very fast and smoothly, without a lot of effort and expense. There are aftermarket parts available for these rifles.
If competitive shooting is your goal...ie: cowboy action.: The Miroku-Winchester 1892, 1866 and 1873 rifles are a good choice. Likewise, Uberti 1866, or 1873 rifles. Since Uberti has been on the cowboy action scene for a long time, there are more aftermarket competition parts readily available than, Miroku-Winchester. This does give Uberti an edge, when it comes to running at top competitive speeds. Still, Winchester is starting to catch up. I'm seeing more of these Winchester rifles appearing on a regular basis at major matches. So, I expect them to catch up, before long. Both brands of rifles are fairly pricey, though. But, quality comes at a price.
As a matter of interest, the Miroku-Winchester 1873 is capable of running competitively, right-out-the-box. If you'd like to see this in action, go to the SASS(Single Action Shooting Society)...'sass forum'.
There, you can view a video made a few months ago(may have to search the archives a bit).... by SASS World Champion: 'Deuce Stevens'. In the video, Deuce takes a stock Winchester 1873 right out of the box and straight into a match, without doing anything to it, other than cleaning out any grease or oil in the barrel and action. The video is a real eye opener. Plus, serves to offer insight into how good the Miroku-Winchester rifles really are.
Marlin rifles...a staple on the cowboy action scene for many years....have fallen on hard times, since the company's takeover, by Remington. Though steadily improving, new Marlin rifles tend to be hit and miss, when it comes to quality control. So, look one over very carefully, before laying down your cash. A lot of them tend to be roughly machined, internally. Most will need some work to get them running smoothly. If a Marlin 1894 suits your fancy...and budget...they can be turned into a reliable rifle, with some judicious stoning and polishing of the internal parts.
Note: Deuce also made another video, featuring a new, box-stock Marlin 1894, under the same match conditions, as the previous Miroku-Winchester 1873, video. As always, Deuce's observations and comments are right to the point. Plus, highly informative. Definitely worth a look, before you lay down any cash on a Marlin, or any of the other rifles. For your interest: Deuce frequently competes, with Marlin 1894 rifles. I believe he set the world speed record.. 10 shots in only 1.55 seconds...with an older, JM-marked Marlin 1894.
Hope some of this is useful, in helping you make your choice. In the interests of full disclosure, I have fairly extensive, firsthand competitive experience with all the rifles mentioned.
Lever action rifles are a lot of fun to own and shoot. I particularly like those chambered for .38/.357. Accurate, low recoil, and cheap to shoot. Especially, with .38 Special. Plenty of reloading components available, too.
By the way....you are correct: lever loop size and overall action stiffness can have some effect on rifle accuracy, or ease of use. Plus ergonomics, to some degree. Personally, I don't like the 'big loop' models. Particularly, for cowboy action competition. Clumsy, slow and awkward, to use. Okay for a cold-weather, plinking rifle, though.