Cee profile benefits:
The lip stiffener provides significant increased strenght compared to no lip stiffener.
More aesthetic for uses in exposed applications such as carports and awnings.
Certain detailing is simpler with Cee section, such as fascia/eaves purlins for gutter installation, edges of roofs, back-to-backor lip-to-lip construction.
Stability during construction is a benefit in some applications such as flooring.