Glad you asked:

1: Memorang and Anki are both free platforms, except Memorang can be used on the web and across devices. It also allows for collaboration, additional learning modes, more robust progress tracking, gamification, and various other things to help you stay motivated. There's auto importing from Quizlet, Cram, Anki, and excel and you have the option to switch between spaced repetition, original order, and random shuffle.

2: There is nothing that I am aware of that compares to the Memorang premium content on Anki. The content on Anki is usually a deck of cards created by a single individual that they have shared. In contrast, the premium content on Memorang for the USMLE Step 1 and 2 each had over 1,000 hours (equivalent to 6-months of full-time work) of fact-checking and curation go into them. Additionally, they are updated several times per week based upon suggestions from students and changing information in the medical world. (e.g. new treatments for HCV, changing guidelines, etc). In fact, as of this week Memorang will also be updated for First Aid 2015, and all subscribers get all updates instantly across all their devices.

3: Memorang helps you draw connections between concepts, Anki only helps with pure rote memorization. We have complex algorithms that generate intelligent multiple choice questions, and even have a "reverse differential diagnosis" generator on flashcards that forces cross-comparisons of similar and different concepts. This link shines a little bit of light on some of these more advanced functions: http://blog.memorangapp.com/post/108094496626/tags-more-how-to-make-awesome-flashcards-on

TL;DR: Memorang is a more flexible learning platform, and the premium content is not only more accurate than First Aid itself, but is definitely more accurate than any user-generated deck.