Like almost any commercial structure a leaky roof spells trouble immediately for your tenants and your reputation. Initially owners had a tendency to gravitate towards screw down metal roofing due to its lower cost. If you were in a temperate climate without much rainfall you may have had few if any issues.
Screw down roofing requires more roof “penetrations” and depending on your location regarding snow loads and rain you may encounter leaks.
Standing Seam Roof Panels eliminate all the penetrations where they are joined at a single rib which prevents moisture from seeping through.