Sorry to be a dissenting voice - London!
Assuming, and this is the big assumption, you could genuinely afford a good equivalence of house/location/lifestyle between Roundhay and Crouch End.
I lived in London for several years (not too far from Crouch End) and some years ago relocated to Leeds (nearly chose Roundhay but ended up in Headingley instead).
It's fine here. Goes without saying that for the same money, we could afford a house in Leeds when we had a flat in London.
There is mostly decent food, there is art, there is music and culture. And if you like shopping (I don't) there is decent shopping. But it's not London.
And the public transport, although it tries its best, is expensive and not great. We often end up driving everywhere.
It's noticeably wetter and windier and colder (to be fair, being cooler could be argued as a plus during this recent freak-weather heatwave
). And darker in winter, which is also longer.
And there's not just a shortage of school places in Roundhay. There's a shortage of school places everywhere in Leeds ^^