It depends on the data you're saving. If the data doesn't need to be linked in some way, a NoSQL solution is a good way to go. If your data is going to be strict in schema and needs to have some kind of relationship with other types of data, I'd go for a relational database.
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It depends on the data you're saving. If the data doesn't need to be linked in some way, a NoSQL solution is a good way to go. If your data is going to be strict in schema and needs to have some kind of relationship with other types of data, I'd go for a relational database.