It can be a wash but there are some differences:
A feeder can be faster than a puller but not by a great amount unless it can feed with the spindle running so you eliminate the time spent stopping and starting the spindle.
With a magazine feeder you do not have to spend time loading bars.
I have a question:
Why SL20 when the part is from 1" bar stock, why not SL10? Costs less and has a higher spindle speed.