We tried breakfast from McDonald's, Taco Bell, Burger King, and Wendy's - here's the winner

The fast-food breakfast wars are upon us.

With McDonald's implementing all-day breakfast, Burger King responding in kind, Wendy's flailing in the breakfast arena, and Taco Bell revamping its morning menu, the competition is more intense than ever.

But in the midst of the battle, some weaknesses are rising.

We tested three main breakfast items from the major fast-food chains.