I have been using and recommending the WordPress plugin, All in One SEO, for years now. It is solid, provides the ability to manage terms that were more difficult before.
Headspace2, by Urban Giraff, is another SEO meta data manager. That means it helps you organize everything your website uses or organize itself.
Is it worth Switching?
So you have put all your efforts into typing specific keywords, overriding titles, and are finally happy with the results of your SEO work. That normally provides a huge barrier to switching tools, not with Headspace 2. Headspace 2 makes migration easy, and instantly gives you more control than you had before.