Durability is the result of design, materials, ammunition, and care (probably in that order). In a perfect world, forged steel would be the ideal, but the old forged BHPs don't seem to last as long as their cast steel replacements, and neither as long as a cast aluminum Ruger.
Sig 210s are good examples of what you can do when good design and premium materials come together. But the Rugers, Sig Sauers, HKs and Glocks demonstrate that 'lesser' materials can easily approach that standard.
Design, design, design. All others are distant seconds.
Personally, I prefer "better" materials, but I view the best stamped steel designs as a creative way of forging thinner parts while avoiding some of the stress risers associated with machining.