I'm pretty sure that in Australia mode 1 is more common. All the transmitters I have seen and used have been mode 1. Personally I think mode 2 is a more logical setup. The primary inflight controls are on one stick and the primary ground controls are on the other stick.

But I have learnt with these things, it's always better to go with the majority. Back when I started learning guitar I decided to get a right handed guitar instead of a lefty one (even though I am left handed). Turned out to be the best descision because it meant my choices of guitar were great, my teacher could actually show me stuff without being utterly confused, I could play anyone's guitar that I picked up and it hasn't hindered my ability in any way.