No. As a user of both Amazon and Google devices (with screens/sticks), Amazon is far more aggressive in their advertising practices. As the other guy said, neither is ad-free out of the box, but Amazon devices will literally make your screensaver/lock screen a full screen ad (even on your TV). Google just has a home screen ad about something that’s going to play on streaming, usually.

If you want NO ads, set up DNS ad blocking or get an Apple TV and use that for streaming. But again, Amazon’s devices are FAR more aggressive about advertising as much as possible. My father has one of those Echo Show things that’s a speaker with a rotating screen attached to it. It’s playing ads almost all the time.