e72bfd15_Cassandra_vs_HBase___WhyNosql__Cassandra
[HBase] By design consitent. Offers a nice convinience method to increment counters. Very much suitable for data aggregation. [Cassandra] 
Does not have any convinience method to to increment a column value. In fact the vary nature of eventual consistency makes it difficult to update/write a record and read it instantly after the update. You have to make sure that R + W > N to achive strong consitency.
Cassandra vs HBase | WhyNosql
Cassandra