What was better about AREXX?
ARexx was basically AppleScript before AppleScript existed. It was widely supported by most Amiga productivity software since it was a selling point in the same way AppleScript support is/was for Mac apps in terms of being the de-facto scripting solution on the platform for automating tasks. So if REXX was the dream, ARexx was the realization of that dream on a personal computer.
Tools like ARexx and Amiga Basic were better (IMO) than what you got on other platforms, but the OS itself was rather meh. I guess you could say it was rather interesting in the sense that it had preemptive multitasking (years before PCs and Macs would) without memory protection... but that's hardly something you'd want to carry forward to present day.