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It depends what sort of distance you want to measure. The R200 isn't much good below 50cm but can work to 3+ metres out, while the SR300 can go as close as 10-15cm but stops around 1.5-2m. The code for the two of them will be identical, so you could easily swap the cameras out depending on your subject.
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Thank you for contacting us. I agree with jb455. You should choose a camera depending on the distance from the camera to the target. The SR300 is intended to be used in indoor applications that require a range from 20 to 120 cm.
You can see a thread that discusses this topic here: https://software.intel.com/en-us/forums/realsense/topic/684852. Also, check the exact ranges here: https://software.intel.com/en-us/articles/intel-realsense-data-ranges
Let us know if this is what you were looking for.