If you want to build your personal or business blog with WordPress and looking for best theme to use, then i must suggest best theme you could ever get and present your self or your business in best way...
I am using "Avada" theme for long time to build couple of my own blogs but also many websites for my customers. When it comes to best presentation of business online, this theme is really awesome. But beside that, so many great features built in are just stunning. Once you get familiar with it's administration panel, you must say it's so professional. At beginning it looks like to many to handle, specially if you are amateur in blog building, but, more you use it, more you can do and bring more shine to your blog.
Beside my great experience with this theme (design), it's also top selling and best rated WordPress theme on ThemeForest.net. 253,551 Sales and average rating of 4.78 by 16307 making Avada step out of the crowd and being best of the best.
Instead of listing all great features of this theme i suggest you visit link above, if you really interested, and see for your self. Also look at the different demos of this theme to get best idea how you can use it for your own or customer's website. Simply you can't go wrong