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I would start off with RMAN w/o compression. Compression is not recommended if your system hogs 100% CPU which may change with RMAN. Please note that even with 11gR2, you need additional licensing to use advanced compression.
In your case , some of the reasons of using RMAN are as follows
--Incremental backup can be implemented reducing your backup time.
--Prior to 10.2 backupsets will skip empty blocks and as of 10.2 RMAN will skip empty blocks reducing the size of your backup.
--With 11g you also have multi-section backups.
i'd suggest to go for AOC,apart from storage cost savings, Advanced Compression also improves memory efficiency and boosts query performance in many cases.