Use pversize seamless gutters and have them installed because contractor with and extruder will be a DIY cost with everything included.
If you chose the normal size gutters, use oversize downspouts since they have twice the area without looking too different.The capacity allows your gutters to carry more and flush out much more debris because of the rate of drainage.
Our townhouse association replaced the old standard size with with a gutter guard type with oversize gutters and downspouts after testing on identical buildings. they also worked better in our cold climate in the winter since frost caps were eliminated.
Dick
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