They are the most tender cuts.
Grilling, searing or broiling.
Most butchers will use a boning knife to break down a subprimal into a steak or retail cut.
It depends on what things are available in your area. Say, if cow was most popular in your area, then there would be a lot of beef. You may not buy expensive cuts of beef because you cannot afford it. If it is cheap, then you may buy more of it.
Beef is the flesh of a cow. If it's been ground, it has flesh and fat combined. Most cuts of beef include some fat. Other than that, it's just the flesh.
Most goulash I have seen is made with ground beef, which comes from trim from all the steaks and other cuts from the entire carcass. Ground beef is made from skeletal muscle.
Wagyu beef is one of the most expensive cuts of beef due to its high marbling and melt-in-your-mouth texture.
There are several dozen types of steak cuts available from your butcher. Rib eye, Round, Sirloin, Chuck and Filet Mignon are a few of the most popular. Chateaubriand, flat iron and skirt are a few of the lesser-known cuts.
See the link from Wikipedia. Most people agree that the top section provides the most tender and flavorful beef; the bottom section provides beef that requires marinating or other tenderizing.
In most developed countries, there are no parasites found in commercially available raw beef. However, there are several parasites that are present in raw beef in developing and undeveloped countries, including Taenia solis (the beef tapeworm).
Butchers use math in their job in weighing and dividing slabs of meat. Most of these processes are computerized now.
First, lets just make both cuts of chicken the same weight and have them be the most "average" cuts possible. Beef tends to be slightly more fatty then chicken, but is far easier to cook because beef does not have anywhere near the amount of bacteria chicken has and therefor requires less skill to judge "when its done" (aka safe to eat). In my opinion beef>chicken