Neither, I'm using just plain ol questrader web, I tested IQ Web when it came out, and when I switched back to regular questrader web, the feeling of wanting to jump in front of a train dissapeared. It was pretty buggy at the time.
If you have a substantial amount and you want to sell, ask to switch. I have only a few shares so, if it stops working on my end, I won't lose any sleep over it.