Using Box2D with 3D graphics

We are planning a mobile game with 3D graphics, and we were going to use the standard physics engine
until Unity 4.3 came out and I came across this
http://x-team.com/2013/11/unity3d-v4-3-2d-vs-3d-physics/
The gameplay is 2D, so the Z axis won’t be used anyway.
Should we go with Box2D on this one for better performance?
Any experiences,suggestions or ideas are welcomed.

Thanks

It depends. Try both of them and use whatever best suits your needs. You might run in to issues mixing the two together though.

Use built in 4.3 2D physics.

Thank you for answering. We’ll have a crack at the built in 2D physics, can’t turn down a performance boost.
However they seem to have a lot less features compared with 3D, guess cause they are brand new, hopefully
they’ll be enough for now.