E2S1 Aglaea, support options, Bronya vs RMC

Hello Fellow Aglaea Mains. I got lucky at the end of Aglaea's banner and got both S1 and E2 for the queen herself (after being in E1 before). I've also invested the remaining pulls this banner and got an early Sunday. That does leave me with a question. My previous team was Aglaea, RMC, Bronya (E1S1), Sustain (currently Lingsha).

As far as I'm aware, Sunday is better than either of those supports, so I'm wondering who should I replace. RMC is E6. If it helps, I'm running Hyperspeed Aglaea with 166 speed before stacking up.

I'd appreciate any comments/comparisons on this. Thanks!

PS: I would rather not run Sustainless either lol.