Measurements and complexity matter
Run length is only one factor. Building height, roofline changes, corners, valleys, access, removal, fascia conditions, outlet count and downspout routing can all change the useful scope.
Material changes the comparison
Seamless aluminum and copper differ in material characteristics, fabrication and finish. Pricing should follow the measured property and selected system rather than a universal per-home figure.
Read about rain gutter installation and seamless gutter planning.