Katalon works much better, I didn’t find any of the problems that affect kantu (freeze, command line that does not start macros, …
Katalon Recorder does not even have a command line! 
And iMacros has not been updated for years, so sooner or later it will stop working.
Seriously, the kantu team asked us to list our most important bugs here so that they can fix it. I think this is very nice of them, and you should take this chance and add your most annoying issues in this thread. Simply saying it has hundreds of bugs does not help them. If you reported bugs in the past, just make a list like user @commensal did and post them here.
For me, kantu works well, no critical bugs to report. But I am waiting for folder support 