I would do flight all the way. The nonsense comment from my experience is really about culture. The culture in an aviation unit is just better than any of the other traditional units. SF units are obviously not traditional units and you can't fill those as a GMO.
In aviation units you are the doc and that is sort of celebrated I guess. The pilots don't want to be grounded and you have that complete power to do that to them. They collectively are polite, glad to see you and get their upslip. When you fix their problem and keep them flying you are their favorite. A lot of the problems have clearly laid out steps to keep people flying. Flight requires more admin work given the work associated with inputting their physicals into AERO but it is minor and trade off with usually less sick call from pilots. You may have to deal with flight accidents and maybe an ARMS inspection but overall not crazy. You get to ride along! Not often depending on schedule but can be fun. When flight goes to the field you are near power, a runway, tents, air conditioning. Helicopters are expensive, need to be able to check the weather, pilots don't sleep on the ground.
From my time with nonflight units I felt a little abused and to be honest sometimes unwanted. Since they feel no one should see a doc they kind of don't want your input at times. Sometimes they view you as just a person who put people on profiles. Now when they need you then they want you but since they don't require you to approve their health to do their jobs you are just not really valued or valued as quickly like a flight unit. Lots of trips to field environments and sometimes tents, sometimes rucking places, sometimes swampy.
If not doing flight then at least go to an airborne unit. The thrill of jumping out of airplanes seems to make up for everything else because my patients all want to go back to their airborne units if they could.
Current GMO bonus is 20K.
If you want opportunity to apply for residency this coming cycle pick a one year assignment. Go Honduras, Egypt, Korea, anywhere with 1 year commitment.