Suggested by Destroyer A Tarantula isn’t very scary to a Kaiju. It doesn’t even matter that this tarantula turned giant, it still won’t be able to do much of anything against a true Kaiju. Battra would be able to blast him to smithereens from a distance and this spider has no real counter to such a technique. The match would simply be over as soon as it has begun and then that would be game over. Battra wins.
DReager1.com 
Again, since Tarantulas only get that big in Science Fiction, Battra all the way. What’s up-and-coming, Red Sonja vs Wil. E. Coyote? Benito Mussolini vs a Silverback Gorilla? Griffith (Berserk) vs a Hippopotamus? Or even, Bucky Barnes (Marvel) vs. Cthulhu?. I am not in favor of these battles, and do not want them added.
Definitely a super one sided match all the way. There’s really nothing a Tarantula can hope to do against a Kaiju like Battra. The match is effectively over before it has even begun. I can say that there are a lot more one sided requests like this one.