I beat Pokemon X last night and I intend on trying out the Battle Maison in it since I've never really tried out any of the battle facilities before. However I also have a copy of Sun that's close to getting done (around the point where you're traveling through Poni Island to rescue Lusamine), so I could try out completing it and unlocking the Battle Tree there. Which one would be better for a newfag at competitive battling to try out first?