First there was the Wall Street Journal which picked the 2007 Expedition EL over the Suburban:
http://online.wsj.com/article_email/SB115647063283745203-lMyQjAxMDE2NTI2NTQyNzUwWj.html
Now, Motor Trend follows with a similar comparison with the same conclusion.
Selected as #1 was the 2007 Expedition EL which Motor Trends says:
Expedition "simply beats a comparable Suburban at its own game"
"EL wins in price, performance, and interior trim/features/space utilization"
Acceleration:
-------Expedition EL 4x4-------Suburban LT3 4x4
0-30.........2.5.....................3.0
0-60.........8.4.....................8.9
1/4 mile....16.2....................16.6
passing......4.7....................5.0