Nitric Oxide AND/OR Creatine?

Recently I've been looking at Nitric Oxide products and reading up on the benefits of taking them. It's a pre-workout supplement that gives you a boost of energy during your workout. However, I'm already taking a creatine pre-workout supplement. Can I take both or would they just interfere with each other? If I do decide to just take one, do you have any suggestions? I've been cycling on and off creatine for 2 years now and I love the results it gives, but I want to see what Nitric Oxide can do.