Yes, they do make a whole bunch of different ones. A quick search at my favorite store reveals 72 different Marathon products (not including different widths of the same model). I admit to only having ridden a few of them. And to each, his or her own, as far as I'm concerned.

I have noticed, however, that the Marathon, whatever sub-model, is often presented as the only viable commuting or touring tire, with superhuman-like qualities. They are certainly good tires, but there are other good, safe, long-lasting tires. And these other options often don't carry the price premium that one pays on the Marathon. In my market, you can get a pair of Ride Tours for the cost of 1 (of the cheapest versions of the) Marathon, and I am not convinced the Marathons last twice as long. But again, everyone has their favorite tire and their own budget.

I don't place a whole lot of faith in rolling resistance numbers, no matter who does the test. Everyone has a slightly different test that produces different results because the tests (purposefully or inadvertently) favor or disadvantage certain characteristics. Only some testers actually do a statistical analysis to show whether differences are significant at all. Move this over to the real world, and if you commute with slightly maladjusted hubs or a mucky chain, or if you tour with fresh instead of freeze-dried food, then you can throw the difference out the window.

But the OP didn't start a rolling resistance thread, so I don't think it's worth arguing about here. Or arguing about it at all. Everyone has their convictions and reasons behind them.