When I replaced the plugs on my 4runner for the first time I found the drivers side had Deso plugs and the passenger side had NGK plugs. I replaced them with NGK.
There is ZERO difference in performance with either using Regular copper, Platinum or Iridium plugs. They perform exactly the same. HOWEVER…the Iridium plugs are designed to last OVER 100k miles…the Platinum’s - about 90k miles and the regular copper - about 60k miles.
My wifes Lexus…the ONLY plug available is the Iridium from Denso. NGK doesn’t even make a plug for that engine. Dealer wanted $24 per plug…I bought them for $13.