Probably a silly question but does the 150 and 200 numbers refer to yards? Or is it a size or weight deal? I assume yards capacity of whatever test line they work off of but I figured it better to ask them just assume LOL

It’s just an arbitrary code as far as I can tell. Check the specs for each individual reel model that interests you. 

For example. A Diawa Tatula 150 will hold 135 yds of 16 lb  line, where as a 200 will hold 185, so yep it's more line.

Isn't there supposed to be a somewhat industry standard, like 10 pound mono or something?

2 minutes ago, pauldconyers said:

Isn't there supposed to be a somewhat industry standard, like 10 pound mono or something?

Nope - just like rods, there's no set standard. Need to look at the reel specs to get the capacity.

Refers to the size of the reel (100, 150, 200, 300, etc.). Just like spinning reels, different sizes have different line capacities and strength of components. Reels within the same size, regardless of brand, usually have similar capacities ( an outlier would be Daiwa reels, they generally have more line capacity then other brands of the same size). As already mentioned, check the specs.

There isn't any standards for fishing tackle.

Logic dictates smaller size numbers = smaller size reel and within a specific reel manufacturer it tends to work. The problem is the different manufactures make have very different size reels and line capacities within each model number. For example spools that hold line come in shallow, deep, narrow and wide.

Tom

You really don’t need over 100yrds. A 40yard cast is a bomb. 
 

The bigger issue is line size. It’s difficult to cast heavy mono from a small reel.