I haven't done Amsterdam, but London is THE city. Literally the only other city I been to that even compares to NYC. Shoreditch felt like fukking college, but the beautiful people were out there. If you are a single breh, you can FEAST in Shoreditch.
I was in Paddington when I was there and it was beautiful and so chill. I also went to an Arsenal match out in Islington and that area seem like an edge hood. Not quite hood, but not quite suburb nice. A decent area.
Paris is a whole 'nother monster. Its old, dirty, cramped, beautiful, charming, romantic, frustrating and convenient all at the same time. There is literally no place like it. For as easy as life would be in London (not just from a language standpoint) Paris is a place that I want to spend more time in. Its probably because I saw WAY more black people in Paris. (Again, I wasn't in South London much when I was there.)