My ds moved from state primary to independent secondary for Y7 last September and I’d say the good parts I’ve noticed are:
They tested all kids at the beginning of term to check for any access needs for learning / exams. My ds does have additional needs but got no help right through primary as apparently he wasn’t the ‘worst’. He now gets to type with an extra 25% time in lessons and exams. He’s gone from being an average student who did the bare minimum and wasn’t bothered with learning to really enjoying learning and gaining good grades. He won a local creative writing competition that they entered him for as he has a talent in that area that’s obvious now he’s writing more than a few lines. He’s happier and feels much more supported.
They have excellent communication between the teachers and students, good discussion if he’s struggling with something, all subjects run focus groups and student led support at lunchtimes if you need extra help. If ds misses a day due to illness he can contact his teacher directly on his school tablet to catch up with what was covered in class and any homework. When he had covid and had to self isolate for 2 weeks the home schooling was excellent, face to face, he was included in all the classes as the teachers had tablets set up on the desks for each isolating student so he was still part of discussions and could see his friends.
Small class sizes help him concentrate, he’s very easily distracted.
The sports/drama/music is great although music lessons are an extra fee as are Lamda classes. They have hundreds of lunch and after school clubs, a couple (golf/climbing/build a guitar) cost extra but most don’t. All students have to commit to at least two a week. Ds tends to choose 3 and has enjoyed them all so far, they’re well funded, so science club for example they get to do lots of fun experiments even though they use up the chemicals and materials.
He’s been skiing with the whole school and a year trip to France, which we paid extra for. Local secondary hasn’t started trips abroad yet since covid.
We opted for independent as he gets more focused support which he needs due to his additional needs. His is a small school that’s focused on the pastoral rather than academic. I did try to advocate for him in state primary but as he was meeting the expected levels he wasn’t a priority. It didn’t seem to matter to his primary teachers that he could have done so much better with targeted support. His primary was rated good by ofsted.
He’s extremely bright but easily bored and quite lazy so a state school didn’t help him achieve anywhere near his best. I don’t know if the things above that I like about the independent do exist in state secondary, I went to a grammar which was excellent but only focused on exam success. Where we live we only have one massive local secondary (180 kids per year) that is now good after 10 years of special measures and changing to an academy and back again.
If you advocate for your kids, have a good local school and can spend the money saved on lots of extracurricular activities and tutors so they’re working to their abilities it’s probably the same. I wasn’t able to get my ds motivated, he’s a really unusual character! His younger brother is very self motivated so I think he’d do well wherever he goes!