In my opinion there is no doubt that WordPress is much better then Wix due to many factors. Among them I will show you a short list in the below infographic. Anyway the below image is not enough to understand how many things you can do in WordPress but not in Wix. Even if you want to make a small presentation website or you need an e-commerce or maybe a huge website with many features WordPress can be the best choices you can make.
As you can see WordPress has more features then Wix and I am sure it will become better and better. Let me know your opinions about this.