Whats the pro's and cons of all the different flavours of Linux?
Hmm.... you are opening a right old can of worms there.
Much the same as asking :
Whats the pro's and cons of Airbus vs Boeing ?
Whats the pro's and cons of Religion X vs Religion Y ?
No clearcut answer .... one consideration could be the commercial backing contributing to the quality of certain distributions.... but that's not something the "open source" community likes to talk about ....