Krunner is better at displaying longer search results. The launcher truncates anything longer than 1 line. Dictionary definitions are an example.
Krunner also keeps what was last typed in, which is very useful if I'm adding up a bunch of numbers, or if I need to switch to a different application before using the result.
It looks like it's the addon's fault, and has already been fixed in the github version. It's also been abandoned, so it's probably not worth keeping around anyway.
It seems to be caused by the FediAct addon, which doesn't make any sense. Disabling the addon fixes the page without needing a reload, so it must be a CSS issue rather than an exception. Edit: it seems the addon is overriding the fadeIn keyframe, but it looks fixed in the github version.
https://crates.io/search?q=neofetch brings up 21 versions to choose from (21 are actual neofetch clones). There is also a library to help you write even more of them.