Hi, just returned from my first Viking Ocean cruise after having done 2 river cruises. There are a lot of similarities, and if you enjoyed one I think you will enjoy the other.
Dining choices are better on Ocean cruises and, in my opinion, the entertainment on the Ocean cruise was disappointing. The ship design and layout is great, it was almost like having a number of very large living rooms, not vast open spaces like on some cruise lines. Not much in the way of shopping. We had some cruise credit and struggled to spend it - I would have liked some new swimwear and a polo shirt but it wasnt to be. The sauna/wet bucket/steam rooms are great, really enjoyed them.