Personally, I see that:
CocoonJS (Ludei) is a really good technology when it works, when it don't work, it's another story, and it seems that when not working, a resolution is really hard to find, since communication is lacking.
GC is more theorical for now, but it could mean:
-Less functionnal when working
-More communication, so problems can be solved more easily maybe.
Seems more like which way would you take:
-to cross the road easily, and risking to be crushed hardly
-to go the long way, avoiding almost every car, it'll take time, but you'd be at home more quickly that going through the hospital after the car crash, and paying the contravention in the process (because it is likely than CocoonJS could be not free someday If I understood well)
I know, easy comparison, but it seems like that for me