I've had a few years experience with both, and IMHO a new clone is better than most of the worn out stuff that seems to be available. I shoot Cowboy, and the top choice of shotgun is the 1897 or 97 as it was later known as.
The clones, at least mine made by Jianshe, is not an exact copy. IOW small parts and screws especially are not interchangeable. There are small design changes, some are improvements, others are just changes to make manufacturing simpler. The metal is not soft or poor quality, and the internals seem properly sized. It does take a bit of cleaning and such to make it smooth, but it will work. Parts may be hard to find when they break. They will break, the real ones broke, the clones will as well.
I've resurrected a "C", and did learn a bit about the inner workings in the process. Unless you know someone that can check over an old one for you, I'd avoid them. They will still shoot even though there are issues.
Some of the issues are:
- Dirt in the action, oil and powder residue caked hard and hindering proper operation. Unfortunately to address some of it screws that defy removal have to be removed.
- Timing of the interlock, around 4 or 5 parts involved in this operation.
- Firing pin length, and hammer spring stiffness.
- Alignment and clearance issues on takedown models.
- Magazine spring usually broken.
- Hammer and sear issues.
- Firing pin block and trigger stop issues.
- Pitted bores (black powder?, neglect)
- Cracked forend, especially on 3 screw models. 3 screw forends are not available. Mine was in 4 pieces, and it was a challenge to get it repaired.
- Magazine tube worn out, new tubes are available but fitting them can be an issue.
- Broken hammer, I don't know why, but I've bought 2 with this malady.
- Frozen screws, some seem to defy removal.
There are about 100 parts in these guns, the operation is involved.
FYI: To resurrect this one I put about 20 hours into it and used a fair number of "new or salvaged" parts. Not worth the $ or time, but it's a shame to just take it down for parts. The bore is smooth and shiny !!!
There is a ton of info on the Winchester 1897 online, that's a plus.