Which of the Vibrating Cock Rings has the most powerful vibrations?

Dear Ruby Dear Ruby
Tor II
Related to: 
I'm looking to buy my boy a ring for his birthday, but looking at the many options available, I'm not sure which one. Originally I had it in my mind to get the Tor II, but I see there are a few other brands available around that price range.

I'm more after the most powerful vibrations more than anything else, so I'd love to field opinions as to which one you all think is the strongest!
01/29/2013
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