I am a Qantas as well as Velocity member (without any status).

I am a Qantas as well as Velocity member (without any status). I relocated to US and my profession involves extensive travel (within-US). Need your guidance on whether I shall continue to use QF / Virgin FFlyer # on my bookings OR register afresh with AA / UA to get more benefits? Is there much difference?

i guess before people answer.....how long do you expect to be in the US

expect here to be for another 1-2 years 

definitely join AA. I did the same - moved to the US and have joined AA.

Redemption for award seats through AAdvantage is MUCH cheaper than QF and the amount of points you are awarded from doing AA flights on your QF account is very low.

Thanks! I was trying to leverage the QF lifetime recognition (had I stayed with QF FFlyer) as I don't believe AA has anything similar

Qantas Frequent Flyer Lifetime Gold takes many years to attain, so if you don't have many years of status, it's not really a worthwhile goal - go ahead with the AA program, with its superior earn/burn.

Watson is right on do not concern yourself with QF lifetime Gold i have had it for years and its a benifit that can allways be jacked or discontined as the QF fine print says.Do AA as above.

Thanks guys for the inputs! Appreciate it!

I will go with AAdvantage