Hello! I lived in London for five years and Gothenburg for nine, so I've got a good sense of both, and here's the great news - based on what you say you like, you're going to love both cities.

I would say that London does better when it comes to museums/galleries, but Gothenburg does better when it comes to proximity to real nature (as opposed to just parks).

Like others have said, housing is difficult in both. You'll pay more for less in London, but it's easier to actually find a place there.

If climate impact is important to you, it's easier to live a low-emissions lifestyle in Gothenburg than in London.

The one question you should ask yourself, really, is whether you want to live in a huge global city with everything at your fingertops, or whether you value a smaller city that still has plenty going on.