Hi, Neither - if you're north London - would look at Heathside. Its under new leadership and I'm hearing great things..... My brothers girl started in reception - its child centered, but academic and they do forest school....kids love it.
Goodwyn has barely any outside space but is excellent academically and I know people that love it. Do you want specifically co-ed? Devonshire house, or Manor lodge or Grimsdell which is part of mill hill if you wanted further out?
No - My brothers children have joined this year and are very very happy. I'm a HE lecturer and know a little about education (!) I've never seen a school like it. Really child centered and I'm passionate about the difference its making in my family's life. You should go and see for yourself