The 3.0 Vulcan is, in my opinion, the most reliable, durable, bulletproof, indestructable V6 engine ever seen on the American road. They never break, save for instances of severe neglect or abuse, and are easy and cheap to maintain. Nothing ever goes wrong with them.
My wife drives a Mercury Sable, with the Duratec. It’s got dual overhead camshafts driven by ridiculously long timing chains and a myriad of coolant hoses. Personally I’d always take a Duratec over a Vulcan because they’re so much peppier and therefore fun to drive.