I am looking at getting a custom leather holster. The holster maker explained to me that 90% of his customers buy his $40 (gun specific) which is soft leather. His $100 holster he says is a thicker hide like kydex. Can you explain the differences in terms of carry retention and overall benefits of one vs other? It will be carried iwb. The gun in question is a m&p 2.0 4.25" with an inforce apl-c light.