What is the difference between console and portable versions?
The sticks between both. The sticks on PS3 are lot easier to "control" than the portable sticks.
The PS3 version also only needs L2 to look around instead of taking your hand off the aim stick to drag the touch-screen to look around. Same for lock-on. While the tap lock-on is nice. It doesn't really help when you can just square on both to auto-lock on and then aim-control to change your lock-on before committing an attack.
But really, the free-aim on the portable version is hendered more by the sticks than anything.