Marble is definitely in the middle of the bunch, which means its decently strong and does not require exceedingly amount of attention but it does need to be cleaned regularly as it can be stained unlike its fellow sibling Granite.
Granite is the durable and strong one, a very independent stone which requires low maintenance for the client as it is hard to stain it or cause damage to the material overall and even if it was damaged, you can quickly and swiftly fix it.
Slate are more of the weaker materials, however they are known to be the more unique and aesthetic one out of the bunch. The slate creates a more pleasing to the eye type of environment when placed in the correct place in the house.