Yeah I guess the difference is that I prefer effects that are always on. Occasionally dievderby will get really strong bursts in power like when carve owl is used, or when enemies are slowed down… and then later down the road 18 seconds of invulnerability which is obviously great.
But then owls are on cooldown for 90(72) seconds and you have nothing to show for 3 ranks investment. Sacrament blessing always up. 100% uptime. Stoneskin cd 60s, mass heal 30s. Rez & revive option. Great synergy with energy beam which hits 3x per second. That’s literally 630 extra dps.
On the other hand. Who else will take diev3? Pure support won’t. Chaplains won’t. Paladin can’t unless you do something really weird. Not a single build in the OP recommends diev3. You’ll definitely be valuable to your group with that 18s invuln.

