Both Game and Window capture give the same quality of capture. Window capture is slightly less-performant than game capture, but the margin is tiny. There is no quality difference between the two.
That's an issue with your setup then; they operate almost identically. If your GameCaptures are 'soft', you've messed something up in your setup.I cant really agree here. In my case (doesn't matter what encoder is use) windows capture is always sharper than game capture. game capture is way softer (or blurry) than window capture. So for me there is a difference.