I have used the Jazz for several years as it was the choice of my surgery and I think of the whole Commissioning Group. I was given a free meter and free strips on prescription. I imagine that the issue is something to do with bulk purchase and price. I have to say that I have had no problems, but as a Type 2 who was on Gliclazide and later insulin, a relatively small dose, it was never so critical for me. I have been LCHF for about a year, still taking very small injections of insulin and so far have had no problems. I would never have thought of doing any comparison as I was getting this free and accepted it as OK.
I have considered myself lucky to get free monitoring kit, as many do not.