Which is better Samsung or Apple for Catholic.

Also, having trouble with yahoo email on Apple s4. What to do?

I got sidetracked w/the email issue and then reread your OP.
What do you mean "for Catholic".  Are you looking for a company that upholds Catholic teaching?

I uses startmail for my email and also their search engine which allows you to search without being tracked.
https://www.ixquick.com/

You will have to pay for the email account but it does allow you to create alias accounts to help thwart spam and such.

The privacy part... I use a rooted older smartphone; my husband uses a flip phone. Email? No: we went back to paper (letters, hand-delivered notes, etc). No online banking, photos, etc.

I found a rooted Samsung Note 4 for a few hundred dollars on (crosses self) eBay. It's old enough that many new apps won't work on it (which honestly? GOOD SIGN!) With a rooted phone, I can freeze/delete Google, Facebook, and other "invasive" apps. In fact, I have few apps except my own, or friend-developers that I send a few bucks to (Calendar, navigation but that's far more costly). THE exception is Facebook Messenger: too many people use it for me to avoid it, but I have the root application X-Privacy to block the worst of FB Messenger's "privileges". (And I never update the app.)

On my computer, I use yandex for email when email is required. I still use YouTube as well, but that's my only "Google" site (and I block most of their beacons with uBlock Origin, which keeps the porn ads off my computer). And I try to find content on other video sites as well. Sure feels like the 3 days of darkness (or at least that the time is approaching).

I intend to keep buying OLD phones (in good condition, and rooted, or able to be rooted.)

For personal reasons I found that rather interesting.  Can you provide any links to docuмentation for same or is that just something that you heard somewhere?

I cannot remember where I read this information, but it was from a Catholic site which was trying to bring the plight of the Filipino Catholics to our attention. You must realize that muslims have invaded the Philippines and so Filipinos feel very vulnerable due to the terrorist attacks on their own homeland. Then Facebook makes these Filipino Catholics watch, report, and delete thousands of videos showing beheadings and other atrocities committed by muslims day after day. It is too much for them to handle. It is too much for anyone to handle.

Google, Amazon, and Facebook are all evil corporations which exploit poor people and do not pay them adequate wages.