Replication vs Data Guard

Hi, experts,
 
Recently I need to think about replication (Golden Gate, or Shareplex or 
Streams) vs Dataguard. I understand they can be used for different purpose. 
Specifically Dataguard is a DR solution. But as I understand it is not saying 
replication cannot be used as DR. I am thinking of that replication should be 
better than dataguard in the area of latency ( here the latency means the time 
difference between a DML statement is done at source and at target). My 
reasoning is replication usually process the redo/archived log at source side, 
extract necessary info and only transport these info over network, while 
dataguard is shiping the whole redo to target(statndy), then process the redo 
at target side. Considering the network latency, seems that dataguard cannot 
beat replication in terms of latency. Am I reasonable? anyone can point some 
public info about such a comparison?
 
We are using shareplex now for a OLTP with 100GB redo per day, occaisonally 
under some condition, we have ~ 60 min latency. I am afraid if we switch to 
dataguard , such latency could be bigger. Your inputs are appreciated.
 
Denis
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