Then I suppose whichever you can get availability at...

SUA probably worth more at the PH than Alila since Alila likely to upgrade you either way but on other hand you'll spend more time in room at Ventana

The other way to think about it is it's really just a free 45K coupon (without ability to use SUA). Are you planning to pay (cash or points) for the one you don't use it on? In that case it's more of a question of rates and/or peak/standard/nonpeak pricing pending your dates