Heard a homeowner say cedar lasts forever and wondered if I'm wrong pushing steel

I was at a supply yard last Thursday and overheard a guy telling his buddy that cedar fence posts will outlast anything if you set them right. He claimed his parents had the same cedar fence for 35 years near Springfield and it was still solid. On the other hand, I've had customers swear by steel posts after a bad run with rot and insects. Around here with all the wet springs we get, I've seen cedar go soft in under 10 years. What do you all think about cedar vs steel for posts in damp climates?