The plugins are not updated as quickly as the language-specific IDEs, sometimes they are several months behind on newer features. Not really a big deal if you wait a few months to update your Python version, but it's annoying if you update early.

I used to use only IntelliJ until a few years ago a Python feature I wanted was in PyCharm but not IntelliJ. I think it was related to the typing module? I can't quite remember. I've just stuck with PyCharm for python ever since.

edit: But also, I've never had any issue copying my key configs between PyCharm, Rider, IntelliJ.