We have travelled both on Oceania Marina ( +1,200 passengers) last year and this year on Regatta (+600 passengers).
On both Cruise the standard of the Cabins , cabin staff, and restaurant staff was excellent, very difficult to improve on this.
The food in our view was slightly better on Marina, a wider choice.
PH 1 cabins are excellent spacious with a good balcony with space for two loungers and a small table.