Originally posted by Nellinator
The human rings were not as powerful as the elvish rings.
Also, they were not afraid of Glorfindel in this situation because there was nine of tem. I was referring to the meeting of Glorfindel and the Witchking in the appendix of ROTK.
Ost-in-Edhil suprassed all (smiths) that they had contrived before; and they took thought, and they made Rings of Power. But Sauron guided their labours, and he was aware of all that they did; for his desire was to set a bond upon the Elves and to bring them under his vigilance.
--Of the Rings of Power
All the Rings of Power were made by the same people. Sauron placed the One Ring on and quickly the Elves removed their Rings of Power and they fled saving three Rings and Sauron gathered the others and gave seven to the Dwarves and nine to the Men.
The Rings of Power that the Nazgûl had were made by the same people who made the Elven Rings of Power. So there is NO proof or evidence to say that the three Rings the Elves had was any stronger then those given to the men.