LeapFrog LeapPad or VTech InnoTab???

This Christmas I'm hoping to get my son an ereader of the children variety. He loves to play games and I thought "why not buy a game that also helps him learn to read??". The problem is: I know nothing about them!! I've done extensive research on both the LeapFrog LeapPad and the VTech InnoTab. I'm leaning towards the InnoTab, however, I'm still not sure it's the right choice. So my question to you is: do you have either of these, and if so, what about either the LeapPad or InnoTab sealed the deal for you?