DOn't know about the Innotab@, but I bought the Leap Pad 2 as a birthday gift for my 3 year old grand-daughter, and she loves it. It is very easy for her to operate and she plays on it every day. Great product. Couldn't be more pleased.
I wondered the same thing before purchasing the LeapPad 2. I went to Youtube and searched LeapPad 2 vs Innotab 2s, there is a great video comparing them. That's what helped me make my decision. Plus we love everything LeapFrog. My son, who is 2 1/2, loves it! It's so durable and responsive, it's hard to believe technology in toys has gotten so good. Plus we love how many Apps, games, and ebooks there are to download from leapfrog.com. My only complaint is that it eats batteries. But you can get a car charger or the recharging system. You won't be disappointed.