We found that both Xamarin and Corona work really well depending on your needs; much better than Cordova for practically anything. Because sometimes clients demand it we have used Cordova and Appcelerator in the past but now we simply refuse; it creates horrible stuff which feels and looks bad unless you sink so much time in it that you could've written in natively for every platform 10x over. It's ok for fast prototyping but actually both Xamarin & Corona beats them there easily too.