I've been always using Rossa, it's pretty good, but during the free rental I just tried the Max (master) putter and it seems even better. Nailed more than half of 10-20ft putts which is unlikely with Rossa (5-10ft is its reliable range). Will need to try more to sort out if it's not just a lucky run... :)
Having said that, if you are price sensitive and don't need the absolutely best performance, Rossa is probably the best bang for the buck.