SPR Build-VLTOR VIS-3 or BCM MK 12 DD14

[Birddog1911]

Planning my SPR build, and here is where I stand on the upper. I'm stuck between a complete BMC MK12 upper with the DD14 handguard, or building the upper myself with a VLTOR VIS-3. I don't know a great deal about the VLTOR, but from what I understand, it sounds like a good way to go with the monolithic upper. Thoughts would be appreciated from those with experience.

Edited to add: I discovered that BCM offers the VIS upper as one of their MK 12 upper options. Now, I have to decide between the DD or the VIS. Then, if I go VIS, I have to decide between BCM and Noveske! Good thing I've got 4 months to decide!