The only negative thing about any metal roof, from a installation perspective, is a slippery roof.
To me string inverters are easier only because i can just clip them together and have one set of lines for a group of panels. Yes the micro inverter give you individual monitoring but you can get that from a TIGO optimizer module as well with a string inverter and the cost will be less expensive the Enphase.
About the slope, if you were using a battery system and you had to get the most winter time power possible, I would keep the angle close to your latitude, BUT, if everything you make is going into the grid and counts on your bill annually, put the panels on an angle that produces the most when there is the longest days. That might only be 15deg or 30 deg.
Where we are, the utility pays me $.80/kwh for everything I produce so I will have it at the angle that nets me the most over the year. Others have a month to month net metering so follow the battery rule
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