Both of them are very good but gameplay wise, you should go for Waver as he fits on any team and makes it better. But to get the max of him, you should have the materials to ascend him to his 3rd ascension at least.
Gilgamesh is also very good self sufficient, Critbuster Servant and with his last strenghing interlude, his AoE NP hits like a ST againt Servants.
But if you don't care about gameplay, you should go for the one you like the most.
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