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The larger surface area doesn't necessarily mean more air flow. I haven't seen any tests conducted, but with AFE being an oil type filter (though I understand better than K&N), it allows for it to likely have larger pores, thereby restricting less. The size difference may put them at equal airflow rates.
I prefer the 6637 simply because it filters better, and has plenty of airflow.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776