The future of webpages are structured mark ups like http://Schema.org, Microformats, RDFa, and JSON-LD. Now for me, having a WordPress theme that has successfully integrated these structured mark ups would definitely win the game.
Being an SEO person with 8 years hands on experience on the industry, there is only one WordPress Theme provider that meets my SEO standard, MyThemeShop.
To save you time from reading, here are the list of advantages that you might be interested in:
- Fast-loading
- http://Schema.org integration
- Microformats integration
- Clean and Well documented codes
- Highly Customizable (you don't have do programming, all you need is click a button, easy right?)
- Adsense Ready
- Better than Genesis Framework (I made a comparison)
- Woocommerce Ready
- Minimalist in Design Yet Powerful and Elegant
- Does not Load Unnecessary Scripts
- lastly I don't want to spoil you on the rest of the features
Example their top performing theme:
Example of their Social Media and Viral Inclined Theme:
One of their themes for Business Websites:
Finally, you can still check WordPress' own list of featured themes if you need further research: https://wordpress.org/themes/
Also, you may check the list of free WordPress themes with Premium features.
At the end of the day, it is your decision to make. Choose the theme that will bring you to the top and will give the right website conversion. Good Luck!