Puritan vs niagara 1200


Puritan psm 136 vs Niagara 1200.

Wich one would be the better choice to clean dirty electric?

A friend of mine is thinking to buy one of them for his Hegel H390.

I myself do use this Puritan power optimizer psm 136 with my Hegel H590 (2x300watt) and an old Sony cdp-xa50es cd player. I do like this Puritan very much.
thei