Squarespace is excellent as well— they are both (by far) the two best website builders.

Weebly is easier and less sophisticated. Squarespace has a steeper learning curve but is more sophisticated.

That being said, Carbon is clearly a play by Weebly at being more sophisticated, so we'll see!

Source: My job is reviewing website builders at sitebuilderreport.com. I've reviewed 50+.