Generally, they are very versatile and sound good of cos with a shimmering which I like. There is a certain warmth to it and yet not overly dark. Personally I like the dark crash and the hybrids.
bright usually cuts into mix very easily while dark blends in well. brighter sounding cymbals usually tends to mellow down after being seasoned for some time so some people actually buy cymbals much brighter than how they would like it to be so they would sound better in the long run!