I use both, but went the other direction. 20+ year Cubase user, found Bigwig interesting last year. Now, I use them both, depending on the project. You will find Cubase to be GADS more performant than Bigwig, but Bigwig is simple to navigate, and very fast starting new projects. Cubase will be fast and responsive even when the project grows past 16 tracks and there are a ton of plugins running, Bitwig not so much. I wind up using Bitwig for small projects, and quick example projects, and definitely for things where I want to use all the built in modular synth like stuff (the grid), and I use Cubase for big projects, doing mixing on other folks recorded projects, voice over work, and projects that require video. (Bitwig needs 3rd party stuff to work with video.). I hope that helps a little! Good luck!

https://www.youtube.com/watch?v=9m0gUiVSZBk

If that helps, there are also videos on the most used key commands in the tip videos there. Best of luck!

Check out the tips series from The Electric Rose on YouTube.