Unfamiliar with local protocols, but-
I would give the GSW to the BLS guys, Start a couple large bore IV's(omit this if the BLS guys cannot transport with the IV's) 100% O2, high flow, treat for shock, bleeding control. MAST pants if applicable, treat for shock, and tell them to run like hell..
Why? Because other than large bore IV's, there is nothing more an ALS provider can do prehospitally for a GSW to the abdomen- at least until they arrest. Unclear where that bullet went, or where the damage is.
I would do the same treatment for the SW, but would take this patient because if they do develop a pneumo or tension pneumo, we can decompress that, whereas a BLS guy cannot.
In a triage situation, both patients would be considered reds or critical, so in your scenario, you need to dig deeper and consider the details and make a judgment call.