I bought these themes about 2 months ago and so far I really like both. After building a few sites in each, I would say Avada is the more polished theme and has the faster more intuitive backend workflow. Avada feels faster no matter what I’m doing. And even though x theme has a front end builder that is visually nice, it still needs work. With that being said, I can see how Avada would be able to get the job done more efficiently. Even though the Avada page builder works in the backend, I think it’s still better.