Better to get SPG AMEX where you can transfer the points into most major airlines. Plus when you transfer 20K points you get a 5K top up bonus for a total of 25K

The SPG AMEX currently comes with a 20K sign up bonus and $120 annual fee.

Here are their airline partners and transfer ratios:

Aeromexico Club Premier 1:1
Aeroplan/Air Canada 1:1
Air Berlin 1:1
Air China Companion 1:1
Air New Zealand & Air Points 65:1
Alaska Airlines Mileage Plan 1:1
Alitalia MileMiglia 1:1
All Nippon Airways (ANA) Mileage Club 1:1
American Airlines AAdvantage 1:1
Asia Miles 1:1
Asiana Airlines 1:1
British Airways Executive Club 1:1
China Eastern Airlines 1:1
China Southern Airlines Sky Pearl Club 1:1
Delta Air Lines SkyMiles 1:1
Emirates Skywards 1:1
Etihad Airways 1:1
Flying Blue 1:1
Gol Smiles 2:1
Hainan Airlines 1:1
Hawaiian Airlines 1:1
Japan Airlines (JAL) Mileage Bank 1:1
LAN Airlines LANPASS Kms 1:1:5
Miles and More 1:1
Qatar Airways 1:1
Saudi Arabian Airlines 1:1
Singapore Airlines KrisFlyer 1:1
Thai Airways International Royal Orchid Plus 1:1
US Airways Dividend Miles 1:1
United Mileage Plus 2:1
Virgin Atlantic Flying Club 1:1
Virgin Australia 1:1