what does deathwing have grey knights don't?

[Prot]

I want to point out this discussion. I realize it is beyond the scope of this thread, however it will give an even broader comparison base against Space Marines in general. I'm not pointing to this other thread because a genius started it (<-- sarcasm!) but instead because I found the thread went from 'man I wish we had unit 'x' to more of a positive way of dealing with what Dark Angels DO bring to the table that others don't/can't.

 

It just might give you some good ideas, or feel better about D.A (that is my intent):

http://www.bolterandchainsword.com/topic/293781-comparing-the-dark-angels-to-the-codex-astartes/?p=3745808