They are for different usecases. Storm is more for realtime data like analyzing twitter or bidding on ads. Spark is very much a in-memory map-reduce and designe

They are for different usecases. Storm is more for realtime data like analyzing twitter or bidding on ads. Spark is very much a in-memory map-reduce and designed for batch computations. Spark makes sense when you just have a lot of data you want to analyze or get statistics on.