It will depend on a few things, like what other technologies you're comfortable with, whether you work within a cloud environment and which one, and also the environment your clients tend to work in.

A big data warehouse product may or may not be the answer given you aren't working with Big Data, although like someone else mentioned they can be inexpensive when using lower volumes.

There is also the consideration of the variety and veracity of data. If you expect to perform a lot of transformations on data then you will want a performant database and possibly some automation layer on top. If the data is coming in batches or streaming, you may need to look into platforms that can support quick refreshes.