I’ve had a pretty bad relationship with most rio lines but I haven’t had any issues with the OBS. I fish an 8wt for stripers and my set up is airflo intermediate running line with OBS heads in intermediate, S3, and S6. I had a rio running line before the airflo and I would definitely not recommend it. Was fine for a little while but soon the coating started to crumble like most rio lines in my experience and tangled at least 9 out of 10 casts. The airflo has been reliable and durable through a full season of heavy fishing. As far as heads go, I tend to fish the s6 most of the time. I like to fish big flies and deeper water generally and this year will be adding a t11 and t14 head to to the quiver to get really deep.
Anyways, I like the OBS heads. Airflo heads are probably great as well but never tried em. Just spare your self the frustration and avoid the rio shooting line! Good luck