Another EXP w/ great experiences using complimentary upgrades on the Hawaii routes.
If I had to choose using a SWU on LAX-ORD or LAX-HNL, hands down I'd choose ORD as it's far more competitive.
I would not, however, go to DFW from LAX just to ride the 763. The 757 is just fine, especially when it chops off at least 4 hours of unwanted flying time!