OxygenOS is actually stock Android. All the customizations that you take for granted using CM are not there and you will be EXTREMELY DISAPPOINTED if you go oxygenOS route at this point.
The fact that CM comes with all those customizations (themes, profiles, etc.) and oxygenOS doesn't, you will have to hunt down and install apps from all over the store to get those. As a downside of that, you will be running all those extra apps that will try to run ads and what not- battery drain!
I much rather wait for CM12!