I thought I would chime in on this one having worked with both.
Praxis is a lot more feature heavy but it has a very steep learning curve and the price tag to go with it. The demos you see are after months and months of training.
Amazing Charts doesn't involve that many clicks. Almost all of the fields are on the Most Recent Encounter Tab. You'll often have to cycle between Imported Items and MRE. Most people pick it up in less than a week.
In terms of IT requirements and cost, it's very different from AC. While with AC, you can skip out on getting a real server. That's not an option with Praxis.
Praxis Info:
Licensing
$10,000 for the first provider
$5,000 for each additional provider
That's not including the server and other software like Oracle.
You will either need 2 physical servers or implement virtualization (cost effective).
Here's the link to the official requirements:
http://www.praxisemr.com/server.htmlA server that meets these requirements is in the $10,000+ range.
The workstations also need i5s.
The Oracle Database 11G software is another $5000-6000.
Then you have to pay someone to set and spec everything out. That will take a significant amount of time and money as well. Varies from person to person.