If you mean mono vs. fluoro and super lines, it is a matter of price point and personal preference.
A lot of people are using 30 - 50lb braid. It just cost a lot of money for quality stuff. I would recommend forking out for P-Line or Suffix. Cheaper braids wear faster. Quality braid will last you all season hitting the water every weekend. Just keep in mind your hookset will have to be a little softer.
Fluoro is something I am on the fence about. It has sensitivity and abrasion resistance, but the price point is also up there. Tying knots with higher test becomes a challenge and it is stiff and memory coils are another issue.
Mono is my preference because it is cheap. Not ensitive like braid, but 17 - 20lb test will rip most lures and fish through the grass. Suffix Elite is stiffer and more sensitive, Berkely/Trilene Big Game is cheap in bulk and very tough with low stretch. Stren Original is becoming my new favorite based on price and well-rounded performance.
Go with a popular brand in whatever category you choose and you cannot lose.