'S3 Metadata storage, SQL or NoSQL?

I see lots of questions, articles, and answers on using DynamoDB (NoSQL) database to store metadata for an S3. I actually have more experience using relational databases than NoSQL. Wouldn't a "RELATIONAL" database be the best choice for the metadata because of all the different parameters (metadata) (relationships) you might want to search for an image stored in S3. This is what I would think. Also, when I look at this link, it seems DynamoDB is a bit problematic.

Is DynamoDB suitable as an S3 Metadata index?

sql-server


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