Different strokes. I own both as well, and quite enjoyed both! Catalyst is the only game in the past year that I made a point to carve out time to play all the way through; glad I did. Love the soundtracks, too!
Subscribe & Save has worked great for us in that regard. Between kitchen, house, and pet supplies we easily have 5 items a month, which gets us 15% off our order (on top of the S&S price).
YMMV, of course. Transparent and Man in the High Castle have been worth the cost, not to mention the Prime shipping (we do get 2-day in our area), and Prime music which has been very useful for both my wife and me.
We feel it's a great value for what we receive. That said, I think it's shady...
It comes in quite handy if for last-minute gifts (birthdays, holidays, etc). We definitely see the value in the faster shipping throughout the year.
Beyond that, we use Prime Video and Music on nearly a daily basis. Video alone (especially with their quality original content) adds enough...