Why not hybrid mobile?
I've always been a believer that if writing a new, innovative application, that using native code seems to be the most productive/efficient path. I do know that there are tradeoffs in any decision like this. I also know and accept that this is just an opinion.
But in truth, you should probably be looking at making your Minimal Viable Product in whatever you are the most comfortable in. Because you'll want to get it out and in potential customers hands as fast as possible and prove that your idea really is as useful to people as you believe.
I'm also going to take a stab here and say that you're probably not a super experienced developer, because trying to launch and support an app across two different platforms in different languages almost simultaneously isn't an easy feat to manage.