I'm developing an app for both the android and ios platform. I'd like to take a route that allows me to only have to code once for both platforms. There are 2 options I've come across:

- Develop in Flash builder 4.5 with flex (actionscript, or I've heard javascript also?)
- Develop using Phonegap (javascript)

The app is very simple - it will use the google api and the phone's geolocation function, then also display more information about the business listings from google map's api. Downloaders of the app will also have to register to become free members. All of this information will have to be put into a mysql database on my server.

So my question is, which is the best route to take with what I am hoping to accomplish? If using Flash builder, is it best to learn actionscript or javascript? What's the best way to connect with the mysql server if I'm writing in javascript, ajax?