Lets say you choose dragoon wyvern path, this would be really nice for soloers and might have a few benefits for partys such as buffs, or you choose the jumping path that gives you more jumps and more damage and maybe skills that can only be used in a party skillchain. So you make a choice, do you play more solo or do you want to be better in a group.

Your going to be better at one thing but worse at another and thats the choice you make, and mob resistances etc etc would mean there wont be an "all out" greatest path to choose. You will be better at somethings and while another path will be better at other things.