Unless you're planning on blowing a load...of cash, a parlour is probably a better option. I've had three threesomes organised by the same indy WG and only one came close to my expectations. Based on that, it might take a few bookings to get the reality to live up to the fantasy so you might as well go for vfm to keep pursuing the dream, if you choose.
Just to be clear, my parlour recommendation is based on other's reports at Sheridans, where Nicola seems to have a knack for punter pleasing, not my own experience. EM