Look here
http://www.flyertalk.com/forum/onewo...help-here.html
http://www.flyertalk.com/forum/infor...help-here.html
Generally AA is considered the best for long haul awards. And no surcharges unless on BA/IB
BA is good for short haul awards, due the way they are calculated. But be careful with cash surcharges
But its not the same for everyone.
You just need to get your spreadsheet working. This tool may be of use
http://www.flyertalk.com/forum/trave...demptions.html