Who to see, lady I have seen before, no longer advertising, but seeing old clients, we get on well and she delivers!

Another lady, I did book once but had to cancel, she was great about it.

Who to see, guaranteed good delivery or new lady who might be better/worse.

Depends on what you're after. If you want to get your sack empty then you opt for a reliable option. If you think you'll survive disappointment and want some adventure, then i suggest option B.