Hooh boy. This is the real price George will pay for taking so long. Fans create and become invested in rich headcannons that will never match George’s writing no matter how he answers the big questions. That user is setting themself up for more disappointment if Dream is published than if it isn’t.
Stannis is the most straightforward choice, but remember that we still don’t really know what the Others are or how they can be defeated. If the only thing that can defeat them is fire, then the the best WOT5K outcome might be whoever leaves the realm most vulnerable to Dany’s invasion so that she’s in charge and invested in the fate of Westeros when the Others arrive, which probably means Joffrey. If the only thing that can defeat them is Bran and/or the COTF, the ideal victor is whoever is most likely to take Bran and ice magic most seriously, which might be Robb, given the family connection, belief in the Old Gods and the likelihood that Robb himself was a warg.