Well, one thing we can say definitively today is that VoltDB offers strong serializability, when almost no other clustered systems do, and when they do, they are slow.

But my more typical answer is the combination of throughput and transactional logic. No other system does both as well as VoltDB. This comes up a lot in policy enforcement, fraud detection, online gaming, ad-tech, billing-support and more.

Here are some blog posts that might help:

https://voltdb.com/blog/winning-now-and-future-where-voltdb-... https://voltdb.com/blog/apps-need-acid https://voltdb.com/blog/call-center-example-integrating-proc...

This video's not bad:

https://voltdb.com/resources/video/transactional-streaming-i...