I try to maintain several trees for different reasons.
I use Ancestry primarily because of their databases and the potential for contact to other cousins. I also experiment on Ancestry, I call it fishing for cousins.
I use Family Search because of their database and source citations. I hate their tree, but I try to maintain and keep it updated hoping that they will call Wikitree for advice.
I use RootsMagic as my personal database and try to maintain it, it is an investment of time, however.
I use Wikitree for direct lines and once connected, learn what I can from others. I have too many reasons why I love Wikitree to list here, however.
I also try and maintain a paper-based file system.
and I use Dropbox as an electronic file system which allows me to share documents like I did on the other G2G post.
And I experiment with other sites as well, My Heritage, Rootsweb, and my personal web page.
And I experiment with other tree programs because each has something unique that helps me find problems and issues.
I need to realy focus and use RootsMagic and my home database and I am investing more time into Wikitree because of the many features I keep figuring out how to use both for source accumulation and cousin bait. I love being able to accumulate my various sources from different online and electronic databases into one location and I love being able to share a profile with someone without them having to pay to see my stuff.
It is a bit messy, but I like to call it "Organic" and "Evolving".