I don’t have experience of either (2 boys), but if you’re on the fence and don’t have much to distinguish between the two, then I’d go for my DC’s preference - they are the ones who will be there for the next 5 years, so they need to feel comfortable.
I know they make new friends, but does she have any friends that are applying to either?
As you say, this year is an unknown with the catchments, but personally I would imagine that 233 would secure a place at Sutton - 15 points or so would be a massive jump.
Although OOA, it may be enough for Handsworth Girls - just to throw another school into the mix for you! Did you visit that one, and what were your thoughts?
I can see her views on Sutton being too posh - DS2 thought the same of BV
She has done extremely well and all the best with your decision. Hopefully someone will be along soon with a DD at the schools to answer your query.