SQL server 2012 active\passive or active\active cluster

Hi all,

I will two SQL 2012 servers in a cluster, what will be the best mode: active\passive or active\active knowing that will have one clustered instance. When we use active\passive and when to use active\active? Do we use active\active if we have multiple clustered sql instances only?

Note: the two-node sql cluster will be installed on Hyper-V 2012 R2 cluster