#1 Burger King Vs McDonalds.
Burger King and McDonalds are the biggest antagonists. Burger King has the whopper sandwich and McDonald's counters with the Big Mac and Quarter Pounder. They are the two best-selling burgers of all times.
#2 The 2015 allegations!
In 2015, there were serious questions about what actually goes into these burgers. Does their 100% beef mean it really comes from cows?