Coleco is one of my first loves. I've had mine for years now. I has support sure, which is cool. But on the other hand I need to actually get one of mine functioning again. Its not a well built as the 7800, imo.
That said, to me its comparing apples to oranges, Coleco was more of competition to the 5200.
I think the 7800 has potential, but it was just never fully realized. For example fire up Ballblazer for the NES and on the 7800, it blows the NES clear out of the water.