https://www.warcraftlogs.com/reports...et=4&options=8
Those were my Mythics last week (doesn't count Vault of the Wardens, we had to do that on another day because of time constraints).
Across every single pull, JUST the heal from Fallen Crusader averaged 8.83% of my total healing. It ticked 512 times, and I cast Death Strike 867 times, for an average of 203k and 509k heals, respectively.
https://www.warcraftlogs.com/reports...t=4&options=16
That is the same thing except it shows my buffs. I had a 71% uptime on the 15% strength buff, which is nothing to scoff at. Of course, this data is actually pretty misleading because it counts downtime for breaks and whatnot. If you assume that I kept up Bone Shield 100% of the time during actual combat (which is the case except for a few rare exceptions), then I actually had a 95% uptime. Even if you give yourself some wiggle room and cut it 5%, that's still 90% uptime.
While I think Stoneskin Gargoyle is definitely not as terrible as it used to be (lol 2% armor and stamina iirc), and the secondary stats DOES improve your offensive capabilities by a slim margin, I think that Fallen Crusader is without a doubt superior in every way.