If you are using Dropbox for personal uses such as photos and videos and odd documents& using iCloud makes more sense.

To use a Mac or iPhone& you need an Apple ID and iCloud email address. Further to this& iCloud provides a 5 GB email inbox with the storage shared by everything else. In the front& iCloud allows you to store photos in the cloud and sync them across your macOS and iOS devices& allows you to access files across your devices& and makes all this available on the web too. All apps on your Mac or iPhone or iPad access and use iCloud to store their critical data in the background. Cloud storage is part of iCloud& but iCloud is more than cloud storage – iCloud is fundamental to everything Apple. ICloud is entirely different from Dropbox. It allows you to upload files& download files& share files with other Dropbox users and non-users& and allow several business integrations. Dropbox is a cloud storage service through and through and is designed to work across platforms and devices.

Dropbox sign in with apple