Marathon Dureme 26" x 50 mm, both folding and wire bead, have been out of production for a number of years, but SJS had a few batches made specially for them. I don't think they have any left. They were a very good compromise for mixed riding on tarmac and tracks and paths.
Marathon Supreme production stopped more recently, they still seem to be available on at least one French website in the 26" x 50 mm size.
I prefer the Supreme for use predominantly on tarmac roads, where rolling resistance is less than the Dureme but the Supreme isn't quite as tough and not quite so good as the Dureme on tracks and paths. Puncture resistance isn't too bad, I average about 1 puncture every 5,000 kms.
For off-road use the Marathon Mondial is good, this is tougher and heavier than the Dureme and should last a bit longer, it is the current Schwalbe offering for long-distance expedition touring. But it has more rolling resistance than Dureme or Supreme on tarmac. Still available in 26" x 50 mm in folding (the ones I have are the folding version in the discontinued 26 x 55 mm size) and wire bead versions (cheaper and slightly less puncture resistance). Not yet had any punctures with this tyre, according to Schwalbe's ratings puncture resistance of the folding version is supposed to be better than Dureme, and not much worse than Marathon Plus.
The Marathon Plus is heavier still, and IMO not as good as the Marathon Mondial off road. Rolling resistance on tarmac is IMO slightly worse than Marathon Mondial, but I have never yet had a puncture with the various Marathon Plus tyres I have used (not huge distances, mostly on visitor bikes where I don't want visitors messing with the rear wheel after punctures). I'm not a fan of Marathon Plus, in a given size to me it feels less comfortable than the other models I have used.
No recent experience of Panaracer tyres.
Continental have the Continental Contact Urban. In the 26" size this is available on German websites in at least 3 widths, 47 mm, 50 mm and 55 mm.
I have the Contact Urban in the 16" size on one of my Brompton folders, it seems to have quite low rolling resistance on tarmac and is reasonably puncture resistant. IMO rather similar to the Marathon Supreme but with wire beads and therefore significantly cheaper.
There are other Continental tyres designed for off-road and mixed use with 26" size options, but I have no experience of these.