Nichrome is a common material for pre-wrapped RDA coils, but you won't see it often in the world of sub-ohm tanks. When you're shopping for sub-ohm tank coils, kanthal and stainless steel are the materials you're most likely to see. Compared to kanthal, stainless steel has a slightly lower resistance and a slightly faster ramp-up time for a given wire gauge. Unlike some of the other non-kanthal coil materials, people generally find that stainless steel doesn't introduce any off flavors that require getting used to.
http://www.zgsteelcoil.com/stainless-steel-coil/