I have the 45 versions of both and I favor the Osprey in every respect except the FRP which is easily remedied with a small amount of ablative. Balance is better, less blow back on my hosts, and point of impact shift seems to be less with the Osprey. YMMV for each of these attributes depending on your setup. The Octane is a great can though and is more versatile with 3 lug options, ammo selection and take down cleaning capability. I prefer shooting the Osprey but there are some applications in which the Octane is the better choice.
There is not a wrong decision here but consider the points that may mean the most to you such as FRP, shooting .22lr or exposed lead bullets, weight / balance, 3-lug, blow back, POI shift (which may or may not apply to your hosts), ect. Personal preference, mission or application should be factored into the decision. However, for me, if I had to give one of them up, the Osprey would stay.