Suffice to say I sold my DR when my SS2 arrived! We found the DR a little too cosy for two - "cosy" is subjective though.
We spent 10 weeks in the SS2 last year, and found it an awesome tent - very spacious, airy, dual entry, good size vestibules, and not at all difficult to put up - very quick even for one once you get the hang of it. It does take a while to get your head around the unique geometry though!
I've never found it difficult to find a suitable sized site - it's not a huge tent, just spacious and very liveable.
The SS1 will fit two 20" mats if the bathtub floor is collapsed a little - something to consider depending on the proportion of time you'll be using it solo compared to as a honeymoon suite.