Currently living in China (but can travel from other countries in SE/NE Asia) right now but will be going home to Los Angeles this year. Just wondering which Airline Credit card bonus signup offer is best (lowest cost) in getting me home (Los Angeles) and back. Thanks.

The ones I've reserched so far are:

Gold Delta Skymiles (free 1st year/$95 after, $1000 spend/3 months for 30k pts)
Pro: No Points Experation
Con: 80,000 points needed

British Airways Visa Signature Card ($95 fee, $2000 spend/3 months 50k points)
Pro: Can transfer to AAdvantage
Con: No Waived fee first year

AAdvantage World Mastercard (free 1st year/$95 after $3000 spend/3 months, 50k points)
Pro: Can go one way to LA from Asia for 35k points
Con: Higher Spending then British Airways