Backing up iPhone 7: iCloud or iTunes

Drew78 wrote:

Which back up for my iPhone 7 is best or most complete: iCloud or iTunes on my Mac?

About backups for iOS devices - Apple Support describes the differences. "Decide which is best for you."

Yes you can do both. They are both good. iTunes maybe more "complete" if it's local, but both will work the same way. iCloud is more convenient if it's set to automatic.

How to back up your iPhone, iPad, and iPod touch(Document Type: Document) Nov 30, 2017 Before you get started, learn the difference between iCloud and iTunes backups, then choose the method that's best for you. If you need an alternative backup, you can make one in iCloud and another in iTunes.https://support.apple.com/en-us/HT203977