my bias opinion is in terms of softest to firmest it goes Recoil - Catalyst - SF. In terms of feel during the swing, i would say SF is lack of feel while catalyst provides the most amount of feel at impact and through the swing. recoil in same flex and weight will feel softer and looser than catalyst IMO. If you want a more stout feeling i would go recoil proto over catalyst and standard recoil. that's just my experience. My ss for reference is 99 with driver.
100% agree with everything in this. if someone loves steelfiber, i'm not sure they would love catalyst as much. i think of catalyst like a steel-y recoil. smooth and explosive but very stable.