I have no experience but I was also considering to replace WordPress with "something" on my blog because of performance issues, crashes and hacks. But I also don't know what to use instead because I also don't want to get deep in to developing and maintaining the website. So I just postponed the change until my blog breaks because of a hack or something and I get upset.
Hugo seems more promising to me because:
-it is written in Go
-promise good performance and because of Go, I am optimistic about it
-promise good SEO and again because of Go I am optimistic about it
-promise to be able to host websites on any server Amazon, Azure, Google, GitHub, Apache, Node
-no dependencies just install Hugo and you can build websites
-have a dedicated themes page which I hope provide better security (themes being reviewed before added maybe)
-bunch of really nice themes and different layouts to choose from (again I am not much of a web dev so I love it)
-last commit was only 2 days ago
-documentation is easy to understand, workflow to develop pages, add content is straight forward
The reason Jeckyll is not my first choice is:
-it is written in Ruby (I don't know about it but seems all web developers hate it, some even calling it dead and slow?)
-do not really promise anything but "it is what it is nothing more or less" whatever it means. Yeah right.
-you have to have Ruby, cmake and gcc installed to build websites (I dislike to install bloat and I don't use Ruby, cmake and gcc at the moment)
-last commit was 2 months ago, maybe it is normal for the project they review the code make sure it safe..etc but....nah
-themes are offered through 3rd party websites, don't know how secure these websites
-I don't fully understand the docs, but probably it is just me being lazy
But I don't know really I could be totally wrong about this and Jeckyll is a much more robust and reliable and more secure solution.
Because I am also considering to replace WordPress for my blog, when you make your decision, would you mind sharing which one you are going to choose and why? Thanks