That's like saying: which fast food is best for you?
McDonald's, Taco Bell, Wendy's, Jack in the Box.
McDonald's, but only by the process of elimination. TB (ha!) uses meat of questionable quality as far as I'm concerned, Wendy's is always f-ing with their prices to appease shareholders that hate the dollar menu (subtle attack on the poor/college students) and their bathrooms seem to be beyond disgusting at every location, and JB has caused viral outbreaks before.
This "McDonald's, but only by the process of elimination."
Juxtaposed with this
"TB (ha!) uses meat of questionable quality as far as I'm concerned"
That is laughable.
I'm about to rock your world. I used to go door to door in Dodge City Kansas. Dodge City has many cow slaughtering plants and a lot of the people in the city work at these plants. In talking to some of the people who worked at these plants, they noted McDonalds get the lowest quality meat.
Taco Bell is by no means a healthy choice compared to Mickie D's, but your assertion that TB has questionable meat while supposing McDonalds doesn't is laughable.