3 or 4 nines electrodes.

Trying to decide on the unit I was leaning towards the SilverGen because it has variable ppm but I just noticed the electrodes are .999, where Silver Puppy advertises .9999. I keep reading these 2 makers are pretty much the same as far as the quality of the silver goes, but wouldn't this difference be big enough to make a case in favor of Silver Puppy? I know .999 is supposed to be good enough but why not choose the better grade?
I really need to buy the silver maker soon to help someone in my family who is sick (and for me too), but I just can't seem to be able to make up my mind.
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