The really hard thing here is to find evidence of one putter being better than another.
As we all know , our golf varies from day to day, so a putt holed today may not be holed tomorrow, there is so little in it .
If I had 2 days of free rental right now, I am not sure I could convince myself that any one putter is better than another.
I wish I was wrong, but I don't believe so.