I'm not sure if I've seen either show actually. I know that I never saw Conan the Adventurer, but I might have seen some episodes of Spider-Man Unlimited. Although, I might be remembering promos for the show instead of actual episodes, but it could have been bother. So, I guess that I'll vote for Spider-Man Unlimited. It's probably the most forgettable animated Spider-Man series, but I feel a bit better voting for a show that I have some vague memories of rather than one I've never heard of.