Horses for courses....
My most recent experience being from a weeks ago. I was on the road and found myself in the Hillingdon area of West London.
If this was a pre-mediated punt, then I'd have organized [days] in advance and
AW would be the advisable port of call...
But in the event of sudden & unprepared onset of horniness, and a short notice need of antidote,
the VS gamble then becomes the realistic option! Of course, it's roulette, there's no guarantees, and it's not even worth checking those VS profiles on UKP!
(In my case, I did however decide on a last-minute AW profile and regretted it (see my recent reviews)).