I'm going to go ahead and make the easy assumption that you are referring to competitive battling, and this answer will reflect that. For future reference, it is usually better to provide context for your question. Because even in this instance, this could mean a number of different things depending on what that context (currently missing) actually is.
In my opinion Oranguru will see quite a bit more play, specifically with sets containing the Ability Telepathy and it's signature move, Instruct. Oranguru itself also has some decent bulk, and rather nice Special Defense to give it a bit of staying power while it works it's magic.
Basically, in a Doubles or Triple battle, you pair Oranguru with a Pokemon knowing one or more powerful multi target moves. The Ability Telepathy will protect Oranguru from any friendly fire caused by that Pokemon, allowing it to do as it pleases. Meanwhile, Oranguru will use it's signature move, Instruct, to force the ally Pokemon to immediately use it's most recently used move again. Basically, the allied Pokemon gets to attack twice in the same turn, with it's multi target attacks. For example, Instruct your Mega Kangaskan to use it's Earthquake a second time (I mean third and fourth...) each turn.