Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

I have two list ideas that are very similar in composition.

The foundation is Grey Knights:
Librarian, PML3, DLD
Strike squad, 5 man naked
NDK, Teleporter, Psycannon, Incinerator, Sword
NDK, but with Psilencer instead of Incinerator
Draigo

Then I add in Mechanicus:
Priest, naked
5 Grav Destroyers

Now comes the difference. I finish up with Grav Cents, but it's either White Scars or Ultramarines

Ultra:
Tiggy
5 Bolter Scouts
3 Grav Cents
Drop Pod

White Scars:
Libby, PML2, Hunter's Eye
5 Bolter Scouts
3 Grav Cents
Drop Pod
With the White Scars, I can also afford a few upgrades on the GK and Mechanicus. The Strike Squad now has an incinerator, and the Priest has the Autocaduceus and a Conversion Field.

The pros for the Ultramarines are:
Tiggy can get Invisibility! Or Iron Arm and Life Leech!
The Cents will get re-roll hits for a shooting phase, and re-roll 1's for another.
One extra WC over the WS list.

The pros for the White Scars are:
Ignores Cover on one of my grav units!
The Servitor unit (with Draigo and at least one Libby) will have IWND!
The Strike Squad becomes much more effective against mobs, and all-around more effective IMO!
Cents will never get bogged down b/c of Hit and Run!

I know that rolling Div can potentially net me Perfect Timing, but having it guaranteed (instead of MAYBE generating and then MAYBE casting) seems like a solid trade-off in exchange for one WC.

The THIRD option is always Loth: and he'd take Life Leech, Iron Arm, and Warp Speed and go with the Cents in the Pod to be a backfield nightmare.

Thoughts? Critiques?

You have summed up proc and cons pretty well I would say do what you prefer just make sure you get sanctuary for 2++ on draigo