Not that they should or could really be compared, but if I'm honest this book was by far the one that riveted me the most. Actually, Mary K. Baxter's account in her book A Divine Revelation of Heaven also blew me away (you can download a PDF, word doc, or audio file of her book here).
The reason these two books stand out so much is that they both give very vivid descriptions of everything... angels they encountered and their personalities/wardrobes/jobs. Buildings and places they entered or were granted permission to learn about, and the purpose they were being shown them for. These books all contain notes throughout to provide scriptural support.
When I first came across this book I was of course very eager to read it, but I didn't like that I could find little to no information on the author anywhere online. I wanted to do some research first to give some validity to the book, etc. One reason, I learned, that it was so difficult to find anything about her, is that Anna Rountree is a pen name. The book was actually written by her and her husband as the Lord granted him revelation to experience it as well. Another reason is that they have made a point not to put their faces out there to "promote" the book by association, as they feel that would only "muck up" the true intentions of the book. Fair enough, I figure.
If you are interested in learning about: angel training schools and their inability to comprehend how or why humans don't believe in divine healing; the Storehouse where new body parts are stored; the Room of Tears; the corrupted strata of Satan and his palace; the throne of God; eating from the hand of God or flying over the earth on Jesus as a great white eagle then you may enjoy this book. The whole book has been recorded as an audio book and can be found as an mp3 here.