PS4 and X1 only. Do your worst and predict.
Some things to keep in mind:
On Amazon.com and Amazon.co.uk (the two markets where PS4 and X1 are closest to each other) both titles are currently positioned as follows:
US: 13 vs. 146 (special edition); 15 vs 180 (normal edition) both in favour of the PS4
UK: 6 vs. 23 (normal edition) in favour of the PS version, also PS4 version 167 days in top 100, X1 version 21 days
Vgchartz US pre orders, not the most accurate but they are there, as of July 4th: 183k (PS4) vs. 65k (X1)
Also MGS titles have historically achieved strong sales not only in the US but also in the rest of the world and most importantly Japan (though with Japan you still have to keep the PS3 version taking away sales in mind)
The Ground Zeroes physical split is according to vgchartz between 4-5 to 1.
So what are your thoughts, I'm thinking a cool 5 to 1 here.