APPRAISAL QUESTION - Which materials are worth more?

[Andrew Michaud]

i have a 5 plex commercial property with a metal roof on the main and metal on three porch roofs below. I have lots of leftover shingles kicking around, nice in color. Thinking about keeping the main roof metal and changing tbe porch roofs to shingles. Will this increase or decrease the value of the property? Reasons I am curious..

Will it decrease because I am using multiple materials instead of sticking with the same material?

Will it increase because some say shingles are more valuable vs sheets of corrugated metal roofing which claim to be a cheap route on your roof.

Will it make any difference?