Generally you would get the left view, but this is not the correct way to rip 2D. The correct way would be to use the 2D disc. There are several reasons why. One, some discs use different gamma levels with 3D to compensate for the glasses this will differ between the 2D release and the 3D release. Other reasons could be they use floating windows which they use to fix edge violations. The floating windows could be on the left and right view so there's no avoiding it. And another big reason is on converted movies they create two views by implementing rotoscoping and painting, this is only for the 3D version not 2D.
Best to use the 2D disc for 2D.
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