I'm not sure there are - at least for a certain sector of potential clients.
Over the past 20 years or so we have been reasonably prolific cruisers with Silversea, Seabourn and Regent. We also had 3 bookings with Crystal at the time of their demise.
We have fallen in & out of love with all of the above in that time. For example we ditched Silversea some 8 years ago as we found the product to be dated, poorly maintained, and far from a luxury experience. We subsequently enjoyed various cruises on the later Seabourn ships and also 'bling central' - Regent - and found them to be far superior in many ways to the Silversea offer at that time.
HOWEVER - last month we enjoyed an inaugural cruise in a Silver Suite on Silver Dawn and were blown away by the ship, the suite, the F&B etc. A a result we now have 5 further bookings with Silversea, two with Seabourn and at the time of writing none with Regent.
To our mind the competition to Silversea has reduced significantly :-
- Crystal are no more
- Seabourn has fallen way behind in terms of the ship offer, specifically the very limited F&B - the ships are dated and they are currently trying to offload the company to a Saudi Pension fund.
- The Regent itineraries are very limited/conventional compared to Silversea, they are not in the expedition market, their older ships are in poor condition, and the 'blingy' new ones are not to everyone's taste (hands up we rather like them !).
Apart from that there are the more niche operators, such as Scenic, Hapag Lloyd and Ponant, plus those that are in the earlier days such as Explora, Emerald, Ritz Carlton. IMHO none of these are currently in a position to offer much of an appeal to the majority of current - or potential - Silversea clients.
As alluded to at the beginning a few years ago I was the most dissatisfied and critical (ex)guest of Silversea. However now I believe that they are in the very best position to meet the needs of a large proportion of the potential market - and according to our TA - the biggest seller of Silversea in the UK - their product is selling extremely well (irrespective of FCC etc). The competition is IMHO very weak.
Silversea are a much larger company/fleet than they were say 10 years ago. They have invested a substantial amount in new builds and clearly wish to see a return on this. Their current pricing & marketing is unlikely to be a short term decision, bearing in mind the long term strategy being adopted by RCCL.
So - it is surely - you pays your money and makes your choice. I believe that little is going to change - in the medium term at least.