When it comes to the Greek yogurt, I always go for the fat free one simply because it allows me to be more versatile without creating a breakfast or cereal that filled with calories. Full fat Greek Yogurt works well as a standalone snack. Still this is purely down to preference as the only difference between low fat greek yogurt and full fat greek yogurt is the milk used during production.
Full fat = whole milk and Fat free = Skim milk.
Yogurt and granola together make one hell of team!
Have a wonderful week.