SE total time is generally equal across the board and useless after you get your ATP mins if not at a regional by then. I'd lean towards getting hours up as quickly as you can. If it's towing banners to do so, then so be it. Don't forget about networking opportunities along the way though. Will your current job get you IFR time? Can you get ME time or meet the right people to get you into the left seat of a twin? Traveling sounds like fun though too. I think I'd take the banner job unless my questions above were a strong yes. You can always go back to CFI-ing. I've never heard of airlines discriminating against banner guys. I have friends who did it early in their careers and it didn't seem to be an issue. Post a question for Lori here, she would know...