Snowmonk Hi. Cloud storage has always been a touchy subject and people love to get heated over it. The fact is all our threat models and use cases are different. If you're well informed and feel comfortable using Dropbox, or any other provider, there's zero shame in it.
Nextcloud is very popular with the self-hosting community. I self-hosted Nextcloud myself too for a while but found self hosting to be too unreliable and time consuming for my needs.
I personally don't use Dropbox due to its lack of end to end encryption. I instead use MEGA, which has been a controversial company but it is one of the few providers supported by FolderSync that also uses end to end encryption.
MEGA's recent encryption exploit
MEGA's security FAQ