I have both.
The Stingers were great for about 2 years. I broke the clasp that holds the ear unit once and the leather will gradually get harder and tiny cracks will happen. When I contacted the manufacturer, I thought he would send out a new clasp for free, being that it was just a plastic piece. He charged me about $12 for a replacement. I have treated the leather with both mink oil and ballglove conditioner religiously.
I just got the Rattlers about 2 months ago. I theorize that the plastic muff might prohibit sweat from soaking in and making them harden up, unlike the leather of the Stingers. They sound great so far.
The Stingers seem to be well made, even a bit more than the Rattlers. I need logetivity and only time will tell as I use the Rattlers solely, right now.