Alright I'm going to have to educate here. I have been working with computers and code for 16 years now, and have used both ATI and Nvidia which I just switched back to AMD after my findings. I had the Nvidia GTX 660 SC modified, switch it out with the sapphire R9 290 oc new edition. The reason I have made the switch is because Nvidia ( in order to obtain that performance ) Bypasses many of the calls Direct X makes and in turn implements their own draw calls. Now by doing this it causes a few issues 1 being visual quality, Nvidia looks muddy and blurry and certain effects are either displayed incorrectly or just plain missing. This is why some games have been broken since the release of the " optimized " drivers. 2. it can cause glitches like what many users experience with the sun effect ( blinding ) after being blinded by the sun and your vision starts to equalize the colors in game will glitch causing a red overly if you will ( something to do with their HDR bypass ) 3. instability, many are plagued with the kernel driver crash when trying to run games.
Now as for AMD, reason AMD has issues is solely due to the bad coding and optimization of Direct X, AMD doesn't cut corners, they let direct X drive the card and follow the draw calls it sends out. Which in turn is why AMD cards have better visual quality and lower performance. My findings on AMD is that there is an issue with tessellation, now is it driver side or direct X I am not fully sure but! I know that Direct X tessellation standard is x32 while AMD can enhance it's quality by x64 which when on x64 there is no performance loss which makes me lean towards it being a direct X issue. This is why Microsoft had to redo direct x 11 and make 12.
As for the stutter, that is solely on the game's graphics engine, how it handles object fade in, if you notice the stutter only occurs when objects or effects appear, like bullets striking the ground or static objects in the distance popping in. This is why they are making a new DCS engine and I have a feeling that they are waiting to release it when windows 10 rolls out with direct X 12 support, because direct X 11 can be very easily converted to 12.