I found this link informative as related to automotive applications:
A Comparison of Tungsten Disulfide and Molybdenum Disulfide
It seems that as the cost of WS2 has become competitive in relation to Mos2 the Tungsten Disulfide is having a potential cost benefit ratio advantage.
A Comparison of Tungsten Disulfide and Molybdenum Disulfide
It seems that as the cost of WS2 has become competitive in relation to Mos2 the Tungsten Disulfide is having a potential cost benefit ratio advantage.