They are available on multiple carriers (iPhone will lose the battle based purely on availability unless they open up to other carriers)
The amount on restrictions, or lack there of, on developing applications
Competition – Multiple phones [...]

DO has been cooking up a location based mobile game over the last month or so, we’re still early on in development but I wanted to share an interesting conclusion I came to tonight while building one of the interfaces.
Our game requires the user to make a new ‘match’ and invite his or her friends [...]

BJ sent me a link to PhoneGap yesterday and asked me to take a peek at it, here are my two cents on it.
PhoneGap as a whole is extremely impressive, but it’s probably more ambitious than functional at this point. The main selling point for the platform is that there is practically no barrier [...]