Just a short post, because there's not a cloud in the vast blue sky here in Seattle and I'd rather be outside with my trees...
For the sake of being contrary (and also because I believe it) I'm with Jay on this one - I find that
nerifolia is really a nicer ficus species for bonsai. I much prefer the shape and size of the its leaves. That said, I should also admit that despite having a couple of them, I'm really not a big fan of ficus bonsai. So one should probably take my opinions with a grain of salt.