You are considering opening a business selling hamburgers and hot dogs and are asking if beef or pork is used!!! Wow…one would think a hamburger joint owner would have that question ticked off the list by now.
Beef, of course!
Pork is less expensive, but local beef or even some imported beef is not all that expensive.
A hot dog shop will fail. A burger joint that does burgers well and adds hot dogs to the menu might do ok. Burger joints are a dime a dozen in the North. Most Taiwanese go to 7-11 for a hot dog or Costco. They are big sausage eaters not hot dogs. German bratwurst might do well. Most Taiwanese will opt for a sausage or hot dog without the bun. Keep that in mind.