I tested both PhoneGap and Titanium and I would go for Titanium. It seemed a lot easier to use to me but like every other frameworks, it showed its limits really quickly.
However PhoneGap allows you to develop native plugins that are not hard to implements (good guys PhoneGap devs made a good doc)
Don’t forget that frameworks like those 2 are just building web app into a native one (it’s called a hybrid app) and they are extremely slow compare to real native apps.
Some would recommend you to use a MacOSX virtual machine but I’d recommend you to find a second-hand macbook or mac mini.
Also, remember to analyze what are your needs for your app and always think about the user experience. Slow app doesn’t get much success.
solved Which mobile app development framework should i use? [closed]