Workday. There's not even a close second.
We've been moved onto Workday and I hate it and I suspect I'm going to hate it even more as I've just picked up a people management role so I will be spending more of my life dealing with it.
Reminds me of K2 process automation which while it has a lot of value[1] forces the UI down particular routes which can be very sub-optimal for the end user.
[1] Whenever I used it I felt like I could have written the small bit I was interested in less time using lots of alternative technologies, but the amount of time to add all the other bits and pieces like reporting and retrying of process steps would kill you longer term.