Actually, in the absence of seeing a 100%+ eidolon pop up on the list, I do prefer to run 2x resist eidolons. This mainly applies to stuff you run a lot of in a single day and can't really wait/reroll your way to a 100%+ eidolon, so advents/raids/union events. Granted, the choice doesn't really matter in advents or raids. It's mainly relevant when you're soloing union event demons and the battle length starts getting longer than... say, 25 turns or so? When a 45% eidolon's ability to save you maybe a turn or two just isn't worth it compared to a resist allowing you to stretch at least a few overdrives more.

It's a very different game from you people and your Thor paralysis trains :P