Spyder is too clunky. I work with a number of remote compute clusters, and like the ability to fire up a jupyter server through ssh, enable port forwarding, and work with the notebook in my browser.

If I need a file browser or I want to quickly view two notebooks side-by-side, Jupyter Lab is still more convenient than Spyder. Although it doesn't support all the features of the notebook, and you end up installing additional extensions managed through yarn and webpack (jeez).