Hi, I just did a kind of comparison of the 2 on another thread this evening, so I've copied it here for you too - hope it helps.
Hi,
The VEA is door-to-door (ie it picks up and drops off at each terminal at CDG, and drops off at each of the Disney onsite hotels, as well as the shuttle bus station (near the entrance to the Parks). Its also a more frequent service than the TGV. And the price of the tickets for the VEA are the same no matter which day, or what time of day, you travel. But, the VEA takes between 45 minutes and one hour to get from CDG to the Disney hotels.
The TGV is very fast - only takes 10 minutes to get from terminal 2 at CDG to the train station (next to the Parks) at
Disneyland. But, you do have to get from the other terminals to T2 to get the TGV. Not a huge problem, I did it with a suitcase and DD aged 6 this month. It takes about 10 minutes to get from another terminal to T2 on the free internal train at CDG (the CDGVAL). Then down 2 levels, and you're at the TGV station for trains out of the airport. Ticket prices vary on the TGV depending on which day, and which time, you are travelling. The TGV to Disney from CDG (and back) are also not as frequent as the VEA.
So, with the VEA, you have a longer journey time, but once you have found the coach, you can just get on, pay your fare, and sit and watch out for the first Disney signposts.
With the TGV, the price varies, its a very short journey time, but you have to get from your terminal at CDG to the TGV station at T2, then you have to get from the train station at Disney to your hotel (not a problem either, as the side door of the train station takes you right to the shuttle bus stops for all the hotels).
For ease, and because I couldn't be sure of landing times etc with our flight (which did end up being delayed) we got the VEA to Disney, and the TGV back. I think both have their merits.
Elaine