Any opportunity to play them both? If the guitar is going to be for serious playing, play them and then decide. If it's more for guitar art, pick whichever wood you think is "prettiest."
I think Ovankol looks very nice if glossy finished. However, there is no appearance comparison if, for example, the rosewood is glossy and the Ovankol is matte finished. If the LTD rosewood is glossy, it will look far better (IMO). OTOH, glossy Ovankol can look as nice or nicer than rosewood, depending on the specific pieces of wood involved.
For example, I have two Brazilian rosewood nylon-string guitars, one is very attractive, the other is very bland and nothing special to look at. So it all depends on the specific pieces of wood, not the type of wood.