To be honest my chocobo will be be 0-9-4
The reason being is that the rank 10 abilities are all pretty much crap. Well maybe not the healing rank 10, but I'd rather have a multi use chocobo.
The reason this is possible is because each rank gives you equal to that ranks value in points to spend.
The first ability is worth 1 point, the second is 2, the third 3 points, and the forth 4 points, and so on.
So when the chocobo reaches rank 10 I will take my 4 points in healing to get the chocobo cure ability, while passing on the aoe Rank 10 attack ability, but keeping all the nice single target damage abilities.