Rocket Ron vs Racing Ralph

I currently have Rons on my bike but the rear tyre is almost bald now so need to replace it. I've heard good things about the Ralphs but wondered how well they wear as they seem to have a slightly smaller block pattern and am concerned they'll wear out even quicker than the Rons. What is the difference between the Ron and Ralph performance wise?
Also, should I put the Ron from the front (still almost like new) on the rear and have the Ralph at the front or put the Ralph on the rear?
If anyone has any other suggestions for suitable tires, I want something light like the Rons / Raplhs, fast rolling and tubeless ready.
EDIT. I ride mostly hard rocky trails, hard dirt paths and dirt fire roads and some loose stoney tracks.
Also, should I put the Ron from the front (still almost like new) on the rear and have the Ralph at the front or put the Ralph on the rear?
If anyone has any other suggestions for suitable tires, I want something light like the Rons / Raplhs, fast rolling and tubeless ready.
EDIT. I ride mostly hard rocky trails, hard dirt paths and dirt fire roads and some loose stoney tracks.
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Rons are based on the same low-profile paper-thin carcass as Freds, whereas Ralphs use the same carcass as Nobby Nics. A Nic on the front goes well with a Ralph on the back, or a Ron on the front with a Fred on the back.
In my experience they both go tubeless very easily too.
Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8