I'd say the 360. They are not going to give you more than they have to. In any event the 360 is a better oil.
The 360 is made by Citgo petroleum but it is a better product than the Syn 3 at least and much more realistically priced.
I thought Syn 3 was also supposed to be made by Citgo. If not, then who makes Syn 3, or does it depend on the day of the week :s