Going to toss a few links for you to look at. In a nut shell SRM Orion is a newer ground up product with native Orion suite integration over Profiler.
If you still have questions let me know.
Thanks for the links..helped in understanding it better.
So basically SRM orion is made native to bring everything into one pane. Features wise i guess both the module are same, correct me if i am wrong.
And i also feel it can help in kind of load balancing to monitor from both the modules...but yea polling will be from both ends towards the device.