It’s 90 percent antenna and ten percent radio, as you may know.
I would invest in what the most likely choice for people whom you will be with to use.
With CB your compromise may be antenna length. You can use FM mode, even with a tone, per a recent FCC decision.
GMRS, legally, would mean everyone is a family member or you all have licenses. Equipment that can all be on the same channel width will make things much less frustrating— many of the cheaper radios are wideband only, whereas the higher-end ones are narrow or can be programmed either way. On my Kenwood units, I’ve programmed one of the function keys to toggle wide/narrow, but I think the software was edited specifically for that option. You can hear the other users if you all aren’t on the same mode, but the audio won’t be as crisp, especially at a distance.
Two meters or MURS, in my opinion, would be the best compromise. Amateur repeaters will help if you are all licensed and want to cover a larger area. Say, plan to change to a certain repeater when you reach a certain exit on the highway. MURS can be incredibly useful with a 1/4 wave antenna on the vehicle, even at legal 2W power levels.