Hi all, hope I'm posting this in the right place. I'm looking to book business class flights in to Sydney and out of Perth from the UK for November (using cash not miles). I'd like to get tier points & was just wondering if I should stick with BA or should I consider one of their One World partners. Which would you consider the best in terms of service & comfort? Is it just BA who don't have direct aisle access for all in CW? Do others charge for booking your seat? Do some airlines accrue more TP's than others?

Many thanks in advance & sorry for so many questions!