Don't pick an airframe based on future potential with the airlines. You have almost a decade of flying for the Army, pick something you want to do there. You will never have another chance to sling rockets downrange for a pinned down infantry squad, or slam on in to pick up a dying American and get them to safety, or thump along with a howitzer under your bird and a gun crew in the back. Yeah fixed wing will set you up better for an airline job, but I cherish my experience as an Army helicopter pilot and wouldn't change that even for a job at the majors right now.