Juggernaut versus Destroyer!Who will win?

Classic Juggernaut will win with Classic Destroyer... after 100 years. Stalemate.

It depends on who is inside the Destroyer, i.e. who is powering it.

With a regular human inside, then Juggernaut has a relatively good chance of winning.

With someone like Odin or Thor inside it, Juggernaut loses.

Destroyer without someone inside, powering it, is just an inanimate object.