Well, the main reason I'm still using Steemit.com is because that's the site I signed up with. I wouldn't want to enter my private key into a site I'm not familiar with. Could end up being phished. I don't even know which one is the valid link for SteemPeak since it doesn't look like it's mentioned in this article.

There are others as well, and I got lucky with busy.org that I didn't get phished losing my account. There's just too many ways to get screwed (DNS poisoning, etc) if you have sizable holdings on the Steem blockchain, so I err on the side of caution.