Older is better.
If the rifle does not have a cross-bolt safety then it's probably a better JM rifle in some ways than the later JM rifles made before the Remington takeover. Not because of the safety, but because the older JM rifles just had better attention to detail and fitting.
Having said that, I'm sure that many of the JM cross-bolt rifles are well-made as well, although in the last couple of years of JM guns I noticed things like loose sight dovetails and sharp-edged extractors in the 1894 models that needed stoning.
The Remington Marlins were terrible but are getting better, but I've still heard that some of them have real problems. I definitely would not consider one of these in preference to a JM rifle.
Your older rifle is the way to go, if it is in good sound condition. Inspect the bore and the chamber with a strong light, after unscrewing the lever screw and removing the lever, bolt, and picking out the loose ejector. Look for pits in the chamber and bore, bore damage or rust.
If you can, run some cartridges through it somewhere safe, to check functioning, chambering, and ease of closing the action.
Check the stock for cracks.