Kria is a combination of several sequencing techniques. You could probably implement it on your own with a small handful of modules but the interface on Grids is far more appealing and engaging to me.
Orca is a different animal (sorry) altogether and was less configurable (to me) in a good way. Orca invited me to push more buttons as opposed to Kria where you can program very specific sequences if you wanted. Orca always surprised me - maybe that's because I didn't learn it well. I also liked that Orca could work with Arc - in a very limited way, albeit - but this is a welcomed perk.
Long story short, I have both and use both. Even though they don't operate the same way, I'm not sure I could recommend the energy and $$$ of seeking out a WW just for Orca. Its very nice, indeed, but there's so much to learn in Kria (and Ansible's included apps in general) that most folks would be happy with just that. I have WW in one system and Ansible in another. Orca stays loaded on the WW module. Ansible gives you more flexibility and I would think its possible to port Orca to Ansible.