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I doubt it makes a meaningful difference. For my razors it's always edge leading for the finishing. For my edcs though I find edge trailing works at least as well as edge leading. I couldnt say yes but i wouldnt say no. Lol.
Depends on what steel you are going to be sharpening. There are many steels that dont play nice with jnats. I own 2 dozen jnats and use diamond plates and or diamond bonded stones to sharpen all my kitchen and edc knives.
I've used 325 DMT 600 DMT and for many years a 600 chosera. Just know that after a while and you torque the blade slightly to the edge everything gets done a lot faster. My first gd took me 4 hours to hone.
I really can't stand using tape. The freaking stuff should be illegal. Lol. What I do and have continued to do is when I hone I start with a 1k. Refreshing a bevel removes hardly any steel and you know what you have.