What makes Silversea distinctive

We are just starting to look at the premium lines, so I wondered if you could say what it is about Silversea that makes your ships stand out from the other premium lines - what would you describe as your USP?

Most of our recent cruises have been with your former cruise line. Two of our 3 booked cruises are on that line (2017 and 2019), while the one in the middle is on the Silver Spirit (7/24/18). A lot of what's good on the other line is as a result of your efforts.

How is Silversea different from the prior line, other than that (for better or worse) excursions are included on your prior cruise line.