Which Retainer Is Better – Hawley Or Essix?

Hi. :D
I’m getting my braces off in roughly 3 months (so close!) and I was wondering about which retainer to get. My orthodontist hasn’t exactly informed me about any choices yet, but I think if I could develop a preference it would help.
So, the Hawley container is the colorful molded one with the metal wires which fits to the roof of your mouth. The Essix container looks somewhat like Invisalign – clear and plastic. My brother got an Essix when he got his removed, but he complained of kanker sores from wearing it. :P
So, those of you who have gotten your braces off – what do you think? :D

How Much Do Essix Retainers Cost, With Impression Charges?

I’m looking into Essix retainers, and I’m trying to get a price range on them before I pay $50 to an Orthodontist to tell me something that takes them 30 seconds to explain. I’m also interested in how much the impressions usually cost, because I’m going to need them for new retainers.
FYI: Essix retainers are like invisalign, in that they’re retainers that are made of plastic only that fit over your teeth, rather than around, like metal and acrylic retainers.