This is not the right way to approach this. NoSQL and SQL both have use cases they are suited for, and saying one is better than the other is wrong. Faster writes of NoSQL does help with scaling - but if your app needs transactions than obviously NoSQL won't work.

For reporting, unstructured data is actually not bad. If your report requires you to scan your whole database, then SQL won't necessarily be faster, you have to think about disk performance as well as how complex of a join(s) do you need.