A lot depends on whether you want to boil water or whether you want to do some real cooking (simmering, reheating, and so on), and whether you are cooking just for yourself or for a group. When touring, you don't need to have the lightest or most compact gear (since the bike carries the weight), so you tend to want something that's more stable, less likely to tip over. Coleman single-burner dual-fuel stoves actually work pretty well. I haven't used alcohol stoves, but they would work, though you might want something like a Clikstand for stability. Jetboil would be OK, but the fuel won't be as widely available as denatured alcohol, Coleman fuel, gasoline, or propane.