The main difference is the upper release value (12 vs 14) and that's where they get the name difference.
Lynn and I have the Power Rail's (or the Fischer equivalent) on all of our skis, and like them quite well. they make it especally easy to move the skis fore and aft of the standard mounting positions.
The other factor in finding your DIN settng is boot sole length. I would be surprised if you were a 3.5, but you are almost certainly less than 6.0. I don't think there would be a noticeable difference between the two in that range. FWIW, I have the PRD 12 because that's what came with one pair of skis and I like the fact that my 6.5 DIN setting is more in the middle of the PRD 12 range. My guess would be that the PRD14's would be a bit heavier as well (with a bit more metal and less plastc in the build),
The Type II and the over 50 cancel each other, so find the right line on the chart and read the value in the column that matches your boot sole length. However, I will confess that we ignore the "over 50" reduction -- we still exert the same pressure on the ski as when we were 49, and I don't think my bones have gotten that much more brittle. I think Midwif has a 5.0 DIN, and she is 120 lbs, Type II, over 50, and a 280 mm boot sole length. Also, don't set the bindings yourself; let a shop do it and torque test the release values -- but I think the PRD 14's would be fine for you. Note that mismatches in height/weight can cause you to use a different line on the chart, but that seldom comes into play.
What are the skis under the bindings?
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