Privacy-loving Luddite needs some translation help <3

Just realizing I never checked a premise that a lot of my effort has been based on…
Is a 4G LTE flip phone safer (privacy wise) than a smart phone?
Is a 4G LTE flip phone safer (privacy wise) than a smart phone that’s been “de-googled” and/or with new OS installed??

I realized that these 4G flip phones I’m looking at are STILL running Android! Oreo 8.1


For some reason I thought they’d have a different OS. So now I’m wondering if its any different than getting a smartphone running an android OS. I mean, I’m not going to be downloading apps on the flip phone. But I probably wont download much/anything on a smartphone either, at least not without vetting it.