Galvanized or Vinyl Coated, and How Heavy to Go
There is more than one kind of chain link, and the differences decide both the price and how much you notice the fence from the kitchen window.
The two finishes, and where each one belongs
Galvanized is the silver fence everybody pictures. The steel carries a zinc coating that holds rust off, and it is the least expensive way to buy chain link. On a back line, a side yard or a working property, it is usually all anyone needs.
Vinyl coated is the same fence with a colored skin over the steel, most often black and sometimes green. It costs more per foot and it buys two things. The coating puts a second layer between the steel and the weather, and the darker color makes the fence recede. Black chain link in front of desert planting all but disappears from the patio door, while a silver run is the first thing your eye lands on. If the fence sits somewhere you look at every day, that is usually worth the difference.
Height, wire and what the fence has to hold
Height follows the job. A boundary that only needs to be clear can sit low. A dog run wants enough height that the dog stops thinking about it, and how much that is depends on the dog. A yard holding tools or equipment goes higher again, and past a certain height a permit comes into it. Where your property lands gets confirmed before anything is quoted, not after.
The other half of the answer is how heavy the fence is built: how thick the wire in the mesh is, and how thick the walls of the posts and rails are. This is where two quotes that look identical usually differ. A light fence and a heavy fence look much the same on the day they go in and behave nothing alike after five years of dogs, wind and people leaning on them. You get told which one you are being quoted.
Corners, ends and gate posts carry the real load. They hold the whole line tight, and the posts in between only hold the mesh up. Going light on those is what makes a run go slack a couple of summers later.