Burger King is amazing. I don't eat fast food 2 times a week or whatever, but Burger King's stacker is the most amazing thing ever. Wendy's is better, though... McDonald's is horrible.
I live in Australia and cannot judge burger king myself, however McDonald's has at least over here introduced "Healthy" meals, but have never lowered their prices. I prefer a good pizza over a bucket of chips, but that's just me.
McDonalds is deplorable. Horrible food. All of it. Burger Kind is in a close second to McDonalds. They both suck. Same reasons. Jack in the Box is much better.
I would go with McDonalds. Burgerking tends to have crappier service, dirtier stores, and their fries are horrible. McDonalds tends to be cleaner, good fries, friendlier service, (here atleast) and the food isn't really that bad at it unless they over do the seasoning. BUT then again I'm a McDonalds employee so I can't really say one or the other and have my vote counted as fair. But there are my reasons for liking McD's more.
I like McDonalds best. They say it's the most popular restraunt in the world! Trust me. I've been there. On the other hand Burger King has big and angry whoppers which I really like the most. hmmmm.............