I've noticed that most of Joan's listing prices are 'very reasonable' compared to other agents' (hence the reason she is one of the top agents in Canada!), this has both pros and cons for a seller: she provides a fair market price of your home, chances are it will be sold fairly quickly and reasonably. On the other hand, you won't be able to fetch higher prices. Good luck!
I've never met Christine in person, so can't comment on her, but judging from her picture, she seems to be an honest agent.
I've dealt with ANNA OSTAPYK before, she is impatient and does not seem to want to make extra effort to sell you a house.