Ah, your basic 80/20 adventure tire. Tires are like presidents; everybody has an opinion about them. About all I can tell you for now is that you'll have to make an obvious choice about tire bias ---- street or dirt. Street-biased (like your Dunlops) are more comfortable on the road, and last longer. And they'll get you down a fairly pitted dirt or gravel road, where a pure street tire would leave you wrong side up in a hurry. Dirt-biased knobbies will give you a lot more control & confidence off the pavement, but they'll buzz you to death on the highway and you'll burn them up a lot faster. My only recommendation is that, for now, you do nothing until you've ridden a few thousand miles - at least the life of this tire set - and start figuring out what your prevalent riding is going to be.
As for tube vs tubeless, there are guys with vastly more dirt experience than I, who will give you sound advice. I'm not even an 80/20 rider, more like a 99.5/.5 rider. Next month I'm headed to Arizona. Out of 3,000 miles riding, we plan about 25 total miles of dirt road. No knobbies or tubes for this pavement-oriented Texas boy.