[trevvr]

I've looked at this question in Rugby Union. In my opinion. The travel issue is the main factor for home advantage. Travelling is physically and mentally tiring. If you can ease the travel methods. Where you either cultivate a team environment where people will be at ease being away from home / home base. Or travel earlier and in better form. Then you will end up with better away results.

[Aromasin]

In Union, many of the popular leagues are international clubs level. For most of their history, they were split into Southern and Northern hemisphere leagues. Recently that shifted, and the South African teams joined the United Rugby Championship which is European (Ireland, Italy, Scotland, Wales, and before Top 14 became preferred, France). This was because, despite the historical significance, the time zone difference between the South African and Australia/New Zealand teams were too severe. Now South Africa is in the United Champinoship, they only play in a +/-2 hour difference in terms of time zone.