There absolutely were animations e.g. when closing a Finder window, but they were much lighter weight. As far as I'm concerned System 7 was probably the zenith.
So yeah Apple had tacked on vestigial multi-user support, an automatic system update mechanism, USB support, etc., etc. but underneath it was still the same old single user, cooperative multitasked, no memory protection OS as its predecessors. Unlike OSX, MacOS 9 (like 7 and 8 before it) still relied on the Toolbox which was a mishmash of m68k and ppc code.
To be clear, Win98 was a garbage fire of an OS (when it came to stability); which makes it so much worse that Mac OS 8-9 were so bad.
Maybe not on a Pentium, but once you hit 192MB of RAM and some 500 MHz P3/AMD k7, NT based OSes were tons better.
You only realized that upon opening a dozen of IE windows. W98, even SE, will sweat. 2k will fly.
On single tasks, such as near realtime multimedia ones, w98 would be better, such as emulators/games or video players with single thread decoders. On multiprocessing/threading, w98 crawled against W2K even under p4's and 256MB of RAM.
Either way, you're welcome to believe what you like.