Eh, Assault (M)/Ascension (S) can still beat out SRs.
At any rate, for the newer players working on water, take into account the future available SSRs after this...
April: Vritra reprint (Defender (L) sword that FLBs to gain Assault (S) and a Elaborate (M)/Assault (S) arcane)
May: Sloth (Pride (L) glaive that FLBs to gain Barrage (S) and a Assault (L) bow that FLBs to gain Exceed (S))
September: Kyuuei/Jiuying advent (Assault (M)/Defender (S) gun and a Defender (M)/Vigoras (S) axe)
November: Haruhi collab (Defender (L) staff)
January: Patience (Assault (L) staff that FLBs to XL and a Defender (L) hammer that FLBs to XL)
And all the water SRs in those future events are single skills, I think?

And speaking of SRs...
Sitri's release weapon is a wind Assault (S)/Defender (S) gun. For people looking to add some HP to their wind teams without hindering their offense too much, guess how many options you'll have coming up.