I would say LinkedIn, Glassdoor, and then WelcomeToTheJungle and ChooseYourBoss.
I gave up on ChooseYourBoss, I don’t know how it is for candidates but the UX for recruiters is awful. Never tried Glassdoor, to be honest it never crossed my mind.
(PS: no open positions at the moment but we’re moving forward with the hires we made in the last 3 months)