80/20 Bronze gives a brighter tone. Use them for a projecting, vintage sound
Martin Marquis strings are silked at the ball end to prevent bridge damage to fine guitars
Medium strings are harder to play but give a bigger sound. Use them on larger guitars that can handle high string tension
Silk and Steel Strings are good for beginners building finger strength. Nylon core/steel wrapped, they are traditionally used on folk guitars.
11-52 gauge for "just-right" play-ability