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Iridium Spark Plug Questions (NGK vs Denso)

9 March 2000
Sacramento, CA
I am going to be changing plugs on my IS300 and the folks on that board do not seem as technically adept as those here. My question is about Denso vs. NGK iridium plugs.

sparkplugs.com sells both but there is a huge price difference.

My question is why the price difference, and does it make any difference between which I choose?

Denso Iridium plug 5303 IK16 0.044 $11.99
NGK IX iridium 3764 BKR6EIX-11 0.044 $6.95
NGK Iridium plug 4589 IFR6T-11 0.044 $8.07

I cannot for the life of me figure out why the Denso is 2x the price of the NGK.