NIL Star vs RCCL Rhapsody

[newandneedhelp]

My husband, 2 teenaged daughters (14 & 16) and myself are planing the Venice - Greece itinerary next month. We are debating on the NIL Star or RCCL Rhapsody and are not sure which would be the better choice. We will do either an inside or ocean view cabin as we are on the end of a school artist tour through Italy and France and funds are getting low! I have read so many reviews and have completely confused myself and cannot make a decision! Would love any insiders info.

[jdvmd]

Are the itineraries the same? Cost? Have you been to these ports before?