I'm just a tad bit partial to Gigan
but
G vs. Gigan is a little tedious at points. I saw
G vs. Megalon long before ever saw
G vs. Gigan, and I think that it's a more fun entry on Gigan's resume. (Maybe that's just childhood nostalgia though -
Megalon was the first G-film I ever owned.) That being said, the final battle in
G vs. Gigan is still worth the price of admission in spite of the stock footage.
Plus you can't underestimate the value of the corn-eating hippie.