I had a chance to sit in both the Envision and 2018 Terrain. I do feel the Envision is more premium in a way than the 2018 Terrain for sure on the inside. I have yet to test drive them out though. I was really surprised that the terrain doesn't even have the laminated glass anymore which I'm a little thrown off as well as how the interior materials don't follow through the back door panels. The push button transmission does feel more airy for sure. The Envision does have the sliding seats which the terrain ditched assuming to save weight? I was also really surprised that the terrain doesn't even have adaptive cruise but somehow they still have active park assist.