I'd have fused both since there exists no dopplegangers in my universe :P

Well first congratz
Aaaaand second, i think you have enough advise to make your own choice already, so im here just to brag about my bad luck: i've spent like 200 gems total (that makes 4x11 times gacha) and i haven't got a single 5* yet. This post just made me feel really really sad