Picatinny Scope Rail MOA Question

Bangarang

NRA Life Member
Full Member
Minuteman
Jun 6, 2013
178
46
NH
I'm putting a picatinny scope rail on a Steyr .308 Win with a 26" barrel. The only two options are 0 MOA and 20 MOA.
I'm going to take this rifle regularly to 600 yards, maybe even 1000. Scope hasn't been chosen yet. Likely to be a Vortex.
Which MOA rail do you recommend?