Choosing a RecoverPoint splitter is based upon many environmental scenarios and hence is ultimately what forces you into your decision. For instance, lets look at the following scenarios and what dictates your choice:
The yellow column defines some of the well known feature sets that are supported with the three types of splitters in the blue columns. So according to this chart if replication of physical RDM's is desired then all three splitters would accommodate. However if you are looking to replicate VMFS datastores then only the CLARiiON and Fabric splitters would do. So with this chart above you could quickly determine what splitter is needed based upon your companies environmental situation and needs.