Hello CRUISELOVER94,
I have not been on either line but from what I have gleaned on this site, if I was taking my whole family, I would definitely take RCCL (actually I would take Princess, but they weren't included in your question). The RCCL ships seem to have many more diverse activities and they seem geared more to families.
You also may want to read some of the reviews of Costa in the Cruise-Reviews section of this site: they are mixed at best.
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