During all the months I played with RoL/Hope, I quickly noticed speed was the key factor to raising FGei. That's why I posted an
Archangel version and advocated its use. However, you have to play the deck a bit differently with AA's. You turn the deck much more into a rush in that you pump the Angels out as fast and early as possible. This results in faster wins, which in itself is an edge against all FG's.
The problematic ones are, of course, Ferox and Chaos Lord. Out of these, only CL matters because you almost never win against Ferox with any traditional version. SoP's will let you do that, however. You also have to calculate damage more carefully against Miracle-using FG's.
So if you can adjust your playing style and take advantage of the AI targeting, my experience is you'll have a slightly better FGei with Archangels. There's been much discussion about this, and testing showed Dragons were better, but I don't think the playstyle was adjusted enough. When it comes to it, what works best for you is best for you :>