Bio media is a surface for bacteria to live on, that's all it is, there is no "one" type that is more magical than another, if you already have bio-balls use them.
If somewhere in the future you find the media isn't keeping up with your fishes production of ammonia and nitrite add some more to the sump.
I have used rings, lava rock, and plenty of other types, and I don't see the difference, to me its all smoke and mirrors, other than the bacterial population fluctuates and coincides with the fish population.
You don't get more bacteria by adding media, if the fish population only puts out X amount of ammonia.

I've also used fluidized bed media (aragonite sand) in addition to other types, but that was mainly to help buffering capacity (alkalinity).