I'm going from memory here, but I switched from the crop tool to the rectangular marquee tool in Photoshop some years ago because the crop tool re-sized my images based on the dimensions of the crop. In other words, if I wanted to crop something to a 4x6 size, the crop tool would re-size the image to the correct number of pixels on each side to make a 4x6. The rectangular marquee tool, on the other hand, allows you to crop to a particular ratio (2x3, for instance), but does not change the number of pixels on a side except to reflect the pixels discarded because they were outside the cropped area. That is the same way the crop tool works in Camera Raw. If there is some way to get the Photoshop crop tool to work like the rectangular marquee tool in this regard, I would prefer to use the crop tool, as it gives you more control.