Vivaldi was started by Jon von Tetzchner, the founder of Opera, and is meant to be a power-user’s browser with an emphasis on customizability and keyboard shortcuts, along with a range of unique features.

They do strip Google crud like FLoC, don’t pander to crypto scams and are employee-owned, you can check out their statements on Vivaldi.com. The only valid reason not to consider them would be that they are not open-source.