This advertisement is about McDonald's Chicken McGrill.
Main Claim : The Chicken McGrill is delicious, fresh, and better for you.
Supporting evidence :
1) Better is about standing out from the crowd. Better is about pushing ahead.
Better is about rising above. Implies that McDonalds is better than other brands.
2) Shows the ingredients being washed, grilled and cut, implying that they are fresh.
3) The burger looks very delicious