I haven't used either one, but can anyone who has used both shed some light on how ember.js compares WRT to ease of use / complexity?
Angular is more mature, well thought out, better supported, much better documented, is logically consistent throughout, supports the concepts of MVC properly (unit testing is a breeze), much easier to use with REST backends I could go on and on.
There simply is no comparison.
Ember, even after the major changes recently, feels like someone's idea of how MVC should be done without consulting any existing standards or ideas about MVC or REST or any related technology and just throwing in things without thinking them through.
Angular feels far more trustworthy and serious to me than Ember by many orders of magnitude.
Neither though are even close the level of documentation and support and widespread relevant reference apps as I was used to in the .net world (for example), but Angular is the more solid choice in my opinion.
I would recommend Angular over Ember at this point in time unreservedly for making actual applications versus websites.
I invested a decent amount of time now in both Ember and Angular (also Meteor) writing a proof of concept app for the next major release of our business software.
Frankly most of the negative comments I've seen here either way are low on actual knowledge and high on axe grinding and emotional reactions.
It's interesting when you see a post here that is in your domain of expertise and then see the reactions to it. It really makes you wonder about all the other stuff that you might not know so much about and how much you can trust what people post about those topics.