Suggested by Destroyer Etrigan has never been all that impressive in my eyes but he has given Superman a run for his money in the past which can’t be discounted. He is fairly agile as well and will be able to dodge Space Godzilla’s attacks. Etrigan will chip away at his defenses with his fire blasts and then ends things with some powerful punches. Space Godzilla is not prepared to resist such an onslaught and would absolutely go down before long. Durability can only help you for so long. Etrigan wins.