Wolf Gold is a bit more accurate in almost all of my 5.56 guns, so I would go with Wolf Gold.
However, I would choose Geco 5.56 over all other brands.
It is the only 'cheap' ammo that reliably prints 1.3-1.4MOA 10rd groups in my SR15 Mod1, and about ~1.8MOA in most of my other 5.56 guns.