The Surly is a very tried and true design. The Marrakesh is more modern, but not necessarily "better". Personally, I like the more mountain-bikey / adventure touring type bikes here. I feel they're more versatile. There are lots of options, some of which have already been mentioned. I'll also throw in the very cool All City Gorilla Monsoon and new Marin bikes like the Lombard, Gestalt or Four Corners, all of which are great designs with varying degrees of trail-worthiness.