Hi Valentina,
I think it depends a lot on the queries.
"Analytics" style queries, which focus on filters and aggregation, and time series oriented functions (e.g. Latest(), work particularly well in Druid, and performance and capacity can be easily scaled up as data size and query volume increases.
If that is not specifically what you are looking for, then please provide some level of detail so we can give you better feedback.
Thanks. John