I would argue that eidolons that provide elemental, as opposed to character attack, matters more, unless either there is an extra effect too good to pass up (e.g. Sleipnir), or the summon effect is just too good to pass up (umm... can't think of any off the top of my head). If 100% eidolons aren't an option, event stuff like Reiki, Baron, Jack Frost etc (with 25-45/20-40% elemental) are what I generally look for next. Elemental attack eidos are the last on the list, because well, it's been established a lot in this forum that they're the least applicable of all.
I don't follow on daily coin... players should be able to farm normal quests for SR eidolons from shop if worst comes to worst, why would they need to rely on gacha R eidos?