Are open back better than closed back? And headphone recommendation request.

Hi, I recently bought the FiiO FT1. I wanted a nice headphone and asked online for a recommendation giving my preferences (price range and good enjoyable bass since I mainly listen to electronic music like dnb) and someone suggested them. Googling online I saw the internet was loving them so I went ahead and bought them. When I got them I had no idea about headphones e.g. open-back vs closed back, planar vs dynamic, etc but now I have a little knowledge. From what I've seen people generally seem to agree that open-back are superior to closed-back in terms of sound quality so I feel kinda bad lol. Is that a fair assessment? Do closed-back have any benefit over open-back apart from sound isolation and reduced noise leakage?

I do love these headphones a lot and they've really opened my eyes to what a nice pair can do. I love the sound stage, the bass and the imaging, but I've heard that this headphone only have a good sound stage "for a closed-back," (is that correct?) so now I want to hear what a truly great sound-stage is like with an open-back pair. I would also like good enjoyable bass, better than FiiO-FT1 if possible (whatever happens the bass cannot be a downgrade), and I would like good imaging/separation. Maybe I would like a planar this time, too, just to see the difference between that and a dynamic driver but this is not necessarily required (I don't know what's better). I've read that planar has better separation than a dynamic driver. I guess I'm willing to spend up to £300. I would really like something that "punches way above its weight" as people told me the FT1 does. If possible I would also like something that's good for gaming (mic not required) where you can tell where the sounds are coming from in a game like COD or Counter-Strike.

Thanks hope you can help!

PS This is not really an Open Back thread, I was forced to use a flair, cheers.