I went with Dean Torges recommendation and bought the #49 first; had it for ten years before getting a #50. I use the #49 about 4/1 over the #50 and would recommend it, if forced to choose. What I have found is the #49 is better for removing material and he #50 better for final shaping (but it still leaves it rough). Go lightly with the #49 and you get close enough to the same finish as when using the #50 that emery paper will take out the file marks.