Mobile messaging, using an end-to-end encrypted system like WhatsApp or Signal, is the most secure way to communicate. Even the service provider cannot access the plaintext content of delivered messages. They exist in plaintext only at the end points (individual phones).

But if you store the content of those messages with a cloud provider--regardless of which company--you have killed a lot of security value. The plaintext will sit there, just waiting for someone to go get it, and you'll never know if they do.

Email does not work that way. Even if it is encrypted in transit, it is always stored in plaintext in servers at either end. So, taking that into account, which email service provider has the best security team to defend that plaintext. This guide argues it is Google.

There's virtually nothing in security that works this way. It's not the NFL. We don't pick teams and root for them. There are things that Google does that are superior to the alternatives, and there are things Apple does that are superior to the alternatives.

I understand and I agree with your point, however to me Gmail and google drive both fall into one bucket, Google's cloud offering. If any thing I would assume Drive is safer since it isnt forced to interact with an old unsecure protocol. They have full control of how it's implemented.