I don't think so. They both have current limiter circuits, and they both stir the fluid, they are both good units. I just bought my Silver Puppy because it is $50 less. It does the job well.
The silver is working as good or better than the $30 dollar for 4 ounce silver I use to buy, so it has already paid for itself. It's cured a few sick friends and animals of infections.