Not really interested in what you prefer, rather, if wee look at some historical things, typically there's a battle for compatibility.  Whether it's HD-DVD vs Blu-ray, or Windows vs Linux (about 10 years ago), someone had to come out as the dominant player to allow for stable development on the platform.

So do you think either of these mobile platforms will eventually "win" and dominate the market?  If so, which do you think will dominate the market?
If one does, it'll probably become the new "Windows" for phones, having everything developed for it.