Have an Mk1 Kaffenback, and have run 23-28mm tires on it at various times, have had 28mm Conti Top Contact’s for the last 4-5 years, great but expensive tires, never had a puncture with them. The bike stays mainly on road, but if bridleways are avaliable, it goes on them.
Having used 4 Seasons before, nice tires, but Schwalbe Durano’s do the same for far less money.
For Schwalbe Marathons, without knowing which version you are looking at, impossible to know it they will be any good, you can get cheap, heavy ones, or superfast light versions, which will cost, but are far better than the cheap ones, a quick look at the Schwalbe site indicates the nice ones are only available in big 38mm+ sizes.