The two examples you showed to us are both computer generated images, rather than photographs of woven fabric. The issue you are discussing is not really one of choosing between two different Gordon tartans, but simply one of which mill's "blue" you like better than another. That will of course vary from mill to mill.

If you like the shade in your friend's kilt, why not ask him where he got it, and does he know what mill wove the cloth?

Barring that, do as others have suggested and request sample swatches from various mills before you order your kilt.