If this were Space Marines vs Sith, I would say it'd be a closer fight, just because they don't have as much tactical compassion. Jedi are a little weak though, and despite wielding the "force" aren't all knowing/all powerful beings.
I was hoping to get some reasons as to why you think one way or another. I'm a little surprised actually. Generally internet nerdity is highly volatile. I'm surprised I'm not seeing some aggressive opinions here