Either one will make you a nice bow with reflex glued in just like Pearl said. They are both very quick by longbow standards. I'm wanting to make another BBO for myself by October. Working on a decent piece of osage right now, soon as I pick the right one I'll be going at it soon.
Be careful with the Ipe that you don't get any hingy spots, it's not nearly as forgiving of your mistakes as Osage is but very doable none the less if you pay attention to detail.