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The lower the coil resistance will provide a warmer vape. The temperature of the vape can also have a slight impact on flavor. A lower resistance coil will also impact battery life (more current drain). If you are using a VV/VW mod the coil resistance factor is negligible, due to being able to vary the power supplied to the atomizer head (coil).
Pg is a better flavor carrier, while Vg is the better vapor producer. To my way of thinking, Vaping is a combination of vapor production and flavor. Taking away too much of either is a bad thing.