iPhone replacement?

It’s time for me to upgrade my phone from the 6S that has been serving me well these past few years.

I have had an iPhone since the original so I know it’s gonna be annoying to switch to something new.

I really want a smaller phone and that is the main reason I don’t want to upgrade to a new iPhone.

I love the IOS/Mac OS ecosystem with photos and messages and phone calls seamlessly switching between my phone and MacBook.

I really want a phone with google maps, phone calls and sms.

The smaller the better.

Suggestions?