The picture that works the best is the one with +1 of exposure, because the background is really white, compared to the others. It blends better and looks better.
The worse noisy image is the second one. At -1 of my right exposure.
The difference I found is the sharpening and the contrast, the RAW image is more soft and the shadows are less dark than the JPG. I also found there is less subtle details in the highlights of the JPG.