Parent with a child at Alty Girls here.
Very welcoming school, with friendly atmosphere. Diverse, and celebrates that diversity. Makes great efforts to ensure the girls feel part of the school community - a 'singles' day for girls starting at the school who are the only ones from their primary school, for example.
Huge amount of clubs and activities. There's a list on the school website.
Teachers are enthusiastic and dedicated, and very open to calls to and from parents about any issues, no matter how minor. It's a teaching school (trains new teachers) so they are knowledgeable about best practice and innovative teaching methods.
SEN: sorry, no direct experience of the provision
Bullying: not heard of any incidents. There are anti-bullying ambassadors though.
Quiet spaces: girls can use the library at lunch and rec (breaktime) for reading, relaxing, playing chess & other games, knitting (!) I think they also screen Ted Talks there too.
There are also lovely gardens. There's a large lawn with gazebos that the girls can access during lunch/rec.
Food:OK - on par with most high school offers. I think there's a sample menu on the school website.
Trips: similar in scope and cost to other high schools
Uniform: can be expensive as all items have to come from the school outfitters. There are second-hand uniform sales at the school though (run by PTA i think)
Buildings: a mix of old traditional (Edwardian?) with very swanky modern extensions and 80s buildings, across a large site. Very pleasant environment - buildings are well-equipped and set in leafy surroundings. Plenty of bright, open spaces, at least in the communal parts of the school. Haven't been in most of the actual classrooms though, so can't comment on those.
Sports: lots on offer, lots of teams to try out for. Dance is on the curriculum up to GCSE level too.
Wellbeing and pastoral care: very caring - lots of info on wellbeing available for parents and pupils. There are wellbeing ambassadors around the school. Homework policy is only to set work if it's purposeful and necessary, and no homework is set at all during school holidays, to give the girls a proper break. This makes a huge difference. There are comments about it being a high-pressure school, but this hasn't been my experience, and I haven't heard this opinion from any other parent with children at the school. These comments often seem to be anecdotal hearsay from people who don't have children at the school, and it certainly doesn't reflect my daughter's experience. She's very happy at school and feels cared-for. Heads of Year seem to be very hands-on with pastoral issues, with both pupils and parents. There are some letters from last year's Year 7s to this year's new starters on the school website (because of COVID, the new girls didn't get their usual transition opportunities). It might be worth having a read of those to see some honest opinions of the school from the pupils themselves.
Possible downsides:
It's a big school - 7 forms in each year plus a sixth form
The school buildings are spread across a wide site, and it can take a while for the girls to find their bearings. They have to cross a road to get from one part of the site to another (they have to cross at the pelican crossing, and go in form groups)
I hope you manage to make a decision - it must be very difficult without having had a chance to visit the schools.