I own some of each and they are both good holsters. The Bianchi holsters are slightly better quality than the Hume holsters I have but either one should serve you well.
I have to concur. I own holsters from both Don Hume and Bianchi. One of my main carry holsters is the Bianchi Professional 100 and it is an outstanding holster. The extra backing is a nice touch keeping the gun away from you and vice versa.
As far as Don Hume, they certainly make nice holsters but in my opinion Bianchi makes better holsters. The leather is thicker and the holster appears to be a sturdier. If I was buying one holster (no one buys just one holster), I'd buy the Bianchi.