Thuris and even moreso cotis leave an edge that almost feels like it can't cut you. You can get away with being a little less careful. Opposite end of the spectrum are high grit synthetic edges... where you need to be very exact to keep your shaving angle right and skin properly stretched.Slice - This was really thorough. Thank you. With regards to the Arks - what do you mean "demanding during the shave itself"? I am not sure fully understand that.
Arks are somewhere in between.