I just used the Metaio SDK Mobile framework. The framework has great potential but has a pretty bad documentation. This highly focused to show 3D objects in front of "real tags", but for a classic AR (with bubbles indicating coordinates) quite a few things are missing. For example I had to implement my own radar because the framework offers none.
I develop the iphone version of one App with this, but in the Android version I know that exist some problems with rotation and some compatibility with recent devices.
The problem is that in the metaio apps all work (and also they have radar) but in the framework not appear to be the same.
I don't know the other frameworks but i recomend you to lose some time trying with a free one. You can try metaio for free and if see that it works fine for you, then buy the payed version.
