I cruise mainly on the two smaller ships as a solo. They are popular so can be very expensive, particularly for a balcony cabin. Even so, their cruises seem to sell well. If Aurora were to go, I think they could fill Ventura as an adults only ship.
My first cruise was on Celebrity Constellation in 2011. I thought it was massive! Two weeks Caribbean. Cost £4000. My Arcadia Xmas cruise this year cost nearly £6000. It is sold out, so small, adults only, still popular.
I like cruises without St P, which I have done too many times. Lots of lovely places to visit in the Baltic. Lovely in the Summer away from the Med heat.