I started with a long cage, but it either got bent or ? and did not shift well. Changed to a medium cage for the 11-25 and it works perfect.
Hello Ndr,
My neighbor's nephew is a bike mechanic and he told me to go with a medium cage. He said that the medium cage just works better and is a better choice, even if it $100 more.
By the way, I beleive that a medium cage on a triple will take a cassette larger than a 13-26, even though I don't think I will ever need it.