We're obviously biased, but there are many benefits of using steel versus wood roofing systems so we'll recommend steel any day of the week. Unlike steel, wood is susceptible to:
Termites
Rot
Fire
Wind damage
and More
These 100% steel roof systems are incredibly durable and low maintenance so even if you're paying a little bit more than throwing a few 2x4's across, it's money well spent in our opinion.