Hardiplank is your best choice
Hardiplank is no question a better product, Certainteed tends to crack and shrink due in my opionion, to the use of "pot ash".
Also, Weatherboards woodgrain is cheap looking in my opionion.
Go with Hardie XLD trim, it is flat out the best trim on the market.
Below is a picture of 3 month old Certainteed weatherboards, the home owner is having certainteed pay to remove and install Hardiplank