I've used both. GoAccess tends to be more useful to me when I have a set of log files and want to track down something specific to the web server config. That's

I've used both. GoAccess tends to be more useful to me when I have a set of log files and want to track down something specific to the web server config. That's particularly handy when working on a server I'm not already familiar with, or when I have logs but no access to the server, since I don't have to run GoAccess on the server itself. It's also the only IIS log analyzer I bother using. netdata is more useful for tracking live stats across live servers that I'm actively maintaining (especially multiple servers), and pulls a broader set of information from more sources, which is handier for tracking down intermittent networking issues. They can both do a little bit of each other's job, which is nice. I tend to use GoAccess more often but think they're both pretty good tools for visualizing server data.