I too have had the pleasure of visiting both ladies. As Calloway mentioned they have two very different attitudes and bodies.
Serenity is tall, toned, likes to talk, has natural red hair and likes to tease. The service is second to none and I have spent more than one occasion with her and look forward to my next encounter.
London is not as tall, has a slim but softer body, she has beautiful soft hair, but I would not say that she is a natural redhed, has more freckles on her orthodontic face and is more giddy and laughs a lot. I found with London it was more down to business with you having to direct the show and she seems to have that deer in the headlights just lay there attitude but is willing to please. I hunted around for reviews on London prior to visiting her, but didn't find anything and TOFTT. In hindsight I would not say that I was disappointed; however I do not have the urge to repeat.