I feel like this question could go two ways: it could be asking for the Pros and Cons of these services verses each other (say PhoneGap vs Cordova); or the Pros and Cons of these types of services as a whole verses creating native apps. Perhaps this question could be re-worded and re-asked. I've also some interested related conversations on stack overflow, if you're interested.
I was asking about the services verses each other. I'd be interested in any helpful links you may have. I looked online but most articles I found were full of fluff, so I was hoping Hacker News could provide some more insightful reviews.