Need advice

damn you lucky rascal of course you grail him
those two are the most grail benefiting/deserving servants in the game

I also have both and I can proudly say I'm glad I grailed both. Is it overkill? Yes, but though they both do phenomenal damage they function differently. From my experience Jalter does more damage when she has advantage (against rulers and berserkers) but cu alter is easier to keep alive, ironically given that he is a berserker. He's also wallet friendly in that he's best either alone or with a tank and support. And who better to tank then Mash right now?