When you get down to it, there are only 3 basic types of string material.
Polyester (dacron)
HMPE (High Modulus Polyethylene, aka UHMWP, aka UHMW)
HMPE/Vectran blends
I think we all know what polyester is. The old stand-by, safe for any bow, has the most stretch, the most creep, and least durability of any the string materials. B-50 or B-55, the latter being a slightly higher grade of polyester with a tad less stretch and a tad better durability.
The original "Fast Flight", invented by the founders of BCY (Ray Browne and Bob Destin), still available from BCY as 652 Spectra, was the first HMPE string material and revolutionized bow strings. Includes Dynaflight '97, 8125G, 8190, Mercury, etc. Comes in different grades with the higher grades having a little less creep and slightly better durability.
The HMPE/Vectran blends are the industry favorite, combining very low stretch/creep with excellent stability and durability, and to me are among the quietest materials. 450 Premium (invented by Bob Destin of BCY) was the very first, followed by 450+, 452X, Trophy, and BCY-X.
Slight differences between each material in each "family" due to varying grades of HMPE and different percentages of Vectran, but in equally well made strings the difference will be small. String construction will generally make as much or more difference than string materials, especially with the HMPE and HMPE/Vectran blends.
Point being, you don't have to go through 100 strings to find "the" one; and on the flip side, when a particular string doesn't work for you it could be something other than the material it's made from.
I'll agree again with the original point...sometimes it can be as simple as putting on a good string to transform a dud into a shooter.