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A wider strop will definitely be easier to use and more efficient AFAIC. As for the treatment, other than neatsfoot oil I don't know. I do know that neatsfoot increases the draw and a very little...

IME top grain, smooth leather is best. It can be cow or horsehide. The characteristics of the strop, draw (resistance) will be more from the way the strop is processed than from the material. OTOH,...