I can’t say that hybrid grapes are better for the environment than other wine grapes, because that all depends on where they are grown, and why they are being farmed in the first place.
In certain areas where Vitis vinifera are hard to grow, vineyards tend to rely more heavily on the use of pesticides, irrigation, and other practices that can be harmful to the environment. In these cases, hybrids can be a great alternative. This is because hybrids are bred specifically to handle certain conditions, such as excessive heat, humidity, lack of water, cold, etc. — with the goal of not needing pesticides, herbicides, and other chemicals in order to survive and thrive. So in certain places, where Vitis vinifera cannot grow without lots of chemical support, hybrid grapes are better for the environment.