Samsung → iPhone: Need Your De-Google Tips

Note: I prefer Apple over Google and I’m not ready to go full privacy-hardened, I want to find a balance between convenience and privacy protection.

So I'm moving from Samsung to iPhone soon, mainly because I despise Google. Want to cut Google out as much as possible while I'm at it.

What I'm planning so far:

• Mailbox.org instead of Gmail
• DuckDuckGo for search, would prefer something even better
• Safari with all the privacy stuff turned on

Where I'm stuck:

• What about YouTube? Just use the web version?
• Google Drive alternatives that actually work well?
• Best way to store photos that aren't big greedy corps?

Questions:

• Any must-have privacy apps once I get the iPhone?
• Settings I should change immediately out of the box?
• Services I'm forgetting that are probably feeding Google my data?