Question Pro or Cons to creating an Anvil world

I'm just curious if there are any issues creating and using an Anvil world on Pocketmine? It's going to be a flat creative world.

Thanks

Using McRegion is faster.

Anvil and McRegion/MCPE chunk packet format, one is ordered in XZY, one is ordered in YXZ (not sure which one is which). If you use Anvil PocketMine needs to translate it, but fit McRegion, PocketMine sends them directly.

Mojang why did you change the order in Anvil!

Is that a bad thing? Will the conversion be noticeable?

Yes when it comes to something you do many times.

What I read is that the order improves compression, so files use storage on disc.

Legacy/conventions vs efficiency/appropriateness