[basseq]

Ancestry.com has the best UI and is the "easiest" to use that I've found. You can use it for free to just build your tree, but you'll feel like a second-class citizen. Their data sources are very good and easy to use, but you pay out the nose for them. (Obligatory note that I very much disagree with how Ancestry.com has set themselves up to collect money off the backs of researchers who often work for free, and will put your inputs behind their paywall.)

So Ancestry.com is a good place for research and for family tree management. I've set up the second half of my stack to generate HTML files, which I keep (publicly) on my personal site.