Appcelerator also allows you to reuse about 70-80% of your code between platforms. Normally once you get to the presentation level you end up having some different code for each platform since iOS has different display APIs than Android. Appcelerator also has an MVC style framework called Alloy, so if your used to coding in that style it makes it pretty easy. Alloy makes your code even more reusable and is built on Backbone.js so if you are familiar with it that will help a lot.
If anyone has any question about Appcelerator feel free to comment below and I’ll try to make sure I give an answer.