it's a bit "different" and many argue it's "more complicated" and it's certainly more expensive, but you've got the potential for a much more powerful FPV system and WAY better videos.
"overall better" is an opinion in this case... but there's no question that the GoPro Hero3+ Black is a vastly superior camera.
If you can't handle the expenses and don't like or want to do the tinkering yourself, then a Vision is "better" because it's easier.
If you want way better videos and more powerful FPV and don't mind the cost, tinkering and installing some things yourself then the Gimbal/GoPro is better. The good news about the tinkering is that there is now a no-solder, plug-and-play cable for the most popular transmitter so you don't even have to splice cables anymore. In my opinion you can go from a brand new out-of-the-box Phantom 2 with H3-3D to a fully installed extremely powerful system in 2 hours or less. assuming you have all the parts on hand of course