The choice comes down to which tempo you think she was best in. The faster swinging early Colombia work of 1935-38 is technically amazing but usually not as moving emotionally as her torch style of the 40s. I would probably go for 'You Go To My Head' which is transitional (1938) and still has a medium tempo while having all the intimate intensity she conveyed in her later work. I'm interested in how others got into her singing and compare these periods.