I'm a big fan of Order/Luck..... mostly because I get bored easily with Order/Turmoil.
With Order/Misfortune, you are taking a gamble that you *won't* get hit with a high unrest event early on (those cost you a lot of money if you do the math!)
With Order/Luck, you are taking a gamble that you *will* get hit with a bonus money event early on
.
I should do another round of tests, but when last I checked Order/Luck gave you the most money on average of any +3/+3 build.
It's not *that* hard to afford it, either - although with most nations you are, admittedly, better off dropping the luck and taking an awake supercombatant.
(edited to fix typos).