I intend to right mobile application that will run on android and iphone ,the application will need to synchronize the data from time to time with the server.
When I started to investigate which technology is appropriate for this task and its looks like HTML5 will do the job.
I notice that there are 2 major frameworks for mobile native application: http://www.appcelerator.com/ and http://www.phonegap.com/ and I donít know what to decide.

Has anybody had any experience with those two?
I will be much appreciated too here about any impression.
Which one do you think itís more easy to develop and itís also working on both mobiles?