I haven't tried IRIDIUM yet, but it is supposed to be better in some ways like, decreased fouling, durability or long term reliability. At a higher price, I think
I am currently using NGK G-Power (Platinum type) and I can say that it is the best among that I've used so far. Malinis at swabe ang idle at acceleration with a little more than 2 yrs of use na.
compare sa stock na SP masmahal ang platinum and mas mahal naman ang iridium compare sa platinum.
been using both platinum ang iridium, platinum(NGK) sa civic and iridium(DENSO) sa revo both engine are stock, since both are stock wala naman akong nakitang gain when it comes sa performance, pero both almost 2 years na pero maganda parin ang takbo wala pang palya, ang ginagawa ko lang every 4 months cleaning ng spark plug, and other regular maintenance like change oil, siguro nakatipid na rin ako dahal sa tagal ng service nito.
Platinum mas matining ang sound Iridium stronger sparks ako i use BOSCH 4 tip spark plugs platinum matining ang sound ng engine pero gains wala naman masyado