> The gender ratios are more favorable for men in both LA and NYC, and it's just easier in general in my experience.
You're assuming the OP is a cishet male. Odds are that you're probably right, but I wouldn't simply assume that.
> For LA specifically: the weather [...]
I don't think LA weather (particularly in the summer) is likely to appeal to the average Londoner more than the weather in the Bay Area.