Of the girls available at MN on Sunday I've only seen Mia. I've seen her several times, like her and reviewed her. The 2 girls you mention are younger, hotter and seem popular. Mia and Sienna are therefore probably too old for your taste. Morgana would appear to me to be less attractive.
At MN you can do a walk in and have the girls introduce themselves, but the last couple of times I've been they've been pretty fully booked.
Like all parlours, some of the girls look just like their pics, others flatter to deceive. Also the room size varies a lot.
Personally looking at the rota I would say there would be someone satisfactory for most people.