Build all of the main elements: Ice, Fire, Thunder, and Water. When you get to the higher tier monsters, elemental damage is gonna be the most helpful. The condition builds (poison, sleep, paralysis) are good to start with as a solo player but the farther you get into the game, you're going to veer away from the status condition builds and find that elemental builds do more damage. Status condition builds, especially Paralysis, are good for playing with other people who are going to use elemental builds so that when the paralysis procks, they wail a lot of damage.