Oh wow. I never realized there were two versions of Choplifter for 8-bit. I only knew of the "pink" version, which was pretty disappointing given the power of the hardware.
My all-time favorite version of Choplifter is the VIC-20 version, which looks similar to the pink version and gets really slow with lots of objects on the screen. Still, the fact that they fit the whole game on the VIC-20 is incredible.
My opinion of the 7800 version isn't very good, and maybe I need to spend more time playing it. I agree that it's well programmed. But it feels unfinished/unpolished to me. For example, the slowness in hostages getting off the chopper. And the bad collision detection on trying to bomb tanks. Is it possible this one was rushed out the door before being perfected?