I think I read somewhere (today, actually) that Chase switches it around, and that it doesn't depend on location. They could pull TU for one guy, EX for the next, and so on.
FICO (06/17/08): TU 691 - EQ 642 - EX 638 - Util 64%
FICO (07/23/08): TU 698 - EQ 653 - EX 644 - Util 50%
FICO (02/04/09): TU 694 - EQ 668 - EX 654 - Util 43%
FICO (05/18/09): TU 687 - EQ 675 - EX n/a - Util 39%
FICO (03/09/10): TU 666 - EQ: 691 - EX 644 - Util 54%
IDGuard (2/8/12): TU 690 - EQ: 710 - EX 710 - Util 72%
FICO (03/13/12): EQ: 696 (87% revolving to limits)