"better servants"... you think there are servants that are better than Cu?
That question is only half joking. Cu is amazing and will always be amazing (just youtube search "cu solo" and watch him single-handedly beat some tough bosses). Furthermore lower rarity servants benefit more from each grail (until they reach lvl 90) than 5*s so he's a good investment.
BUT! Grails should be used on your favorite servants since this game isn't hard enough to force you to use the "best" servants and you can clear everything with your favorites. If you like Cu a lot you can grail him and it will make him even better, but if not I'd save them for someone you like more.
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