I have not come across another line that compares to O for our wants/Needs
Azamara comes in 2nd for similar perks (we do not mind the smaller cabins)
Tried Crystal more inclusive but did not care for the self serve buffet or the evening dining venues
Maybe New Crystal would be worth looking at if the price is right
We do not drink much so any line that includes drinks is not really on our radar unless the itinerary & price works for us
Have been looking at these lines but a higher price point than O
Viking Expedition ships
Scenic Eclipse
Atlas cruises
American Queen Expedition & Ocean cruises
Time will tell where we go from Oceania
JMO