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If the variation is in the body (as I suspect) then the neck lengths will be extremely uniform. With the Lee trimmer the overall length will be very uniform, but if there is variation in the body length the necks will be less uniform.
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I think that is the real difference in how the two trimmers work.
However the use of a case gauge, like the JP Rifles model, does really help with monitoring the case body length/headspace as well as integrity at the base.
If using a case gauge then really either trimmer should do an equally good job, except that the PH can be customized to whatever length you want, while the Lee cannot.