Gravity Forms continues to be the best WordPress plugin ever because it does what other high performers do - it keeps upping its game. It keeps improving. Check out my review of the upcoming 1.7 release.
I've seen a handful of Genesis and Thesis comparison articles and I'm still scratching my head. There's no comparison.
If you were comparing premium sliders for WordPress by performance, which one would win? Which would load the fastest or make the least amount of calls?
If you've been on my site, you have heard about Formidable Pro as a worthy form builder. Here's my official evaluation with a Gravity Forms comparison.
If you love the Catalyst theme for WordPress but have heard great things about Genesis, from StudioPress, you don't have to choose anymore. Now use both.
If you want to engage customers once they've left your site, a call to action reminder is one of the most effective. There's a WordPress plugin for that.