If you need stable predictable performance with low latency and no hassle with maintanence, go with Aerospike. Want to play games, go Cassandra. I've bring Cassandra more than 4 years ago to my company with no regret, but today for the reasons above I choose Aerospike, which is open source and more available than a year ago and biult like a russian tank - with reason.
You just have to know the limits of both platforms. Play with both, choose wisely.
