I am an "absolutely anything guy" if I can get the heat range I want, and almost always lean toward copper core, especially for the CD boxes, but have 2 AC plug stories.
Since the early 80s, the only time I ever had a plug be a cause, wasn't really the plugs fault either. Had a brand new set of AC plugs in a 4 barrel 427 BBC, likely 1988-ish timeframe, HEI no less. Bad choke, wet the plugs, customer tried to swap plugs, couldn't get it running, towed it in to the shop, fixed the carb, tried to dry/clean the brand new plugs, never could get them all to fire correctly. Stuck a set of something else in, likely Champions, and off it went. Never knew why they seemed to soak and never come back, didn't seem logical
Flash forward to last year, 2003-ish Vette, sitting for a year, couldn't get it to fire. Original AC spark plugs from the factory, pulled a few and they were wet but looked nice, swapped a set based on story #1 and it fired up like new. Again, both times had a reason, but the saturation and death of AC plugs seems different than all the others.
I tend to use Autolites for big plugs, and Champion or Autolites in the small plug application, but honestly, the amount of spark plugs I have installed since the 80s and only 2 stories, hard for me to ever blame a plug for anything.