I did a RTW in F a few months ago on BA and QF. I, too, don't think there's a huge difference between the two products. I have a slight preference for BA however, based on punctuality rather than anything else. My SYD/LAX flight was delayed out of SYD due to the crew showing up late and my domestic flights were late as well. Friends in Oz say that QF has real on-time problems both domestically and internationally.