I have a sort of a weird team makeup and I'm struggling to see Sara's value compared to other options.

Currently I'm running a C0 Eula as my main dps (dreaming for C2 someday), a C4 Diona, C0 Raiden, and a slot I'm unsure on. Obviously the synergy of reliable superconduct is nice for the physical output of Eula.

I have C6 Sara, C6 Sucrose, and C5 Xiangling competing for that last spot. Currently I'm leaning towards Xiangling for the flexibility of fire reactions, because while Sucrose is silly with Raiden coordinated attacks, the mastery buffs aren't that relevant.

A C6 Sara though is calling to me to use with Raiden bursts, but the buff doesn't seem that significant from what I have seen. Can someone reassure me or advise what way to go?