I know which side I’m on — the winning side, and that would be the spiders. Here’s a whole photo essay of spiders killing snakes. It’s a real David vs. Goliath matchup, and it seems the little guy (who is often Latrodectus — I really have to get some of those in my lab) typically wins. As the article says, “there are no recorded instances of a snake successfully biting and injecting venom into a spider.”
To be fair, though, that’s probably because of the gross mismatch in size. Spider kills a snake, sits on it for days trying to suck the juices out of it; snake kills a spider, chomp, gulp, it’s done and gone in a few seconds, providing fewer opportunities for a photo op.