I always go for the added DR, but then I'm a Big Guns nut and have to do most of my fighting out in the open while in free-fire mode, so the extra protection comes in very handy.
Due to that playstyle I have no use for Dreamcrusher, although a character who uses little armor and no heavy weapons might get good use from it. The same goes for the Snide route, since most of my preferred weapons don't get critical hits in the first place, but someone who specializes in Energy Weapons or Small Arms may find it beneficial.
Interesting...because the character I got the
most out of Dream Crusher with was my Power Armored "Cover? I don' need no steenking cover!" Big Guns specialist. Between the PA itself and all the other available perks, he got max DR easily without Survival Guru, then Dream Crusher denying the enemy half their crits on top of that was fantastic. Especially at higher levels and in Point Lookout where it was lever-action rifle and sniper rifle fire from every angle.
Not saying you're wrong mind you, I'm firmly in the "whatever floats your boat" camp myself.