Since getting Time Dilation, admittedly only the other day, I have never even considered wasting the cooldown on a free Regen refresh ...

I used it exclusively for boosting durations of Extended Balance, Bole or Arrow. Its even better now, as i can push an Extended Balance on a DPS to 75 seconds.
When you consider that Blood for Blood is only 10% for non DRGs, Its literally 4 back to back BfBs. Thats friggen amazing, ad worth so much more than an free Regen refresh.

Personally, i loved SCH in 2.x, So i have preferred Noct Sect since getting it at 50. Benefic II with Aspected Benefic immediately after is a combined potency of 900, and THEN you get a Shield on top. For burst healing, Its kind of amazing.
Diurnal certainly has had its time in the limelight though, Its great for certain bosses that do predictable waves of smallish damage, or DoTs like second boss in Aery.

If theres a SCH in my party when im doing Trial/MSQ Roulette, I'll happily take the role of Regen provider, and Shield provider if theres a WHM. Or whatever the other AST isn't using.
That flexibility has felt great to me so far. So i really cannot understand people claiming one Sect is worthless over the other.