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Fail Safe vs. Data Guard w/FSF

I am exploring the best approach installing 11g one two servers with the intention of having a coldfusion app webserver tap into it.  I have been looking at DG and using fast start failover, and that sounds great. But I also see Fail Safe (and have the hardware to support that). It appears one of the main differences is the clustered disks for fail safe as opposed to independent data drives for each node using DG. 
Any recommendations?

Also, to consider, my coldfusion app server will point to the active oracle server, so do both Fail Safe and DB use a virtual IP that gets moved to the active server during the failover?

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