According to DW there is no change in rate for SSR servants. The benefits of a muti-roll are given as "1 guaranteed gold card", which usually translates into an SR CE. The benefit of a single roll is simply that you can stop immediately after getting what you want, meaning you won't use excess quartz.
In summary, if you want more gold CEs, do multis, if you don't care about CEs, probably best to stay with singles.
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