If you have the money to afford it and a decent system with a decent internet connection (i.e., you're not using something with 1 GB RAM and a 3 Mbps connection), GR2AE would probably be preferable. It gives you most of the same products you can get with GR3 only with better resolution and more ways to interrogate the data. If you are looking for something to use while chasing, however, I would go with GR3.