My point re Sovereign was in response to the statement that the 4 or 5 day ships cannot compare. Recall I said it was better in some ways,that doesn't translate into comparable,please don't put words in my mouth. But when I think about it was just as happy on Sovereign as teh Magic. So maybe they are comparable in some ways.
Depending on what you are comparing- yes it is comparable,in some ways better. On Sovereign,our waiters knew how to take a cocktail order,and had memorized it on the second night. Not so on the Magic,they screwed it up for the first 3 nights,then we gave up. On Sovereign,our waiters gave us clean utensils after each course,not so on the Magic. On Sovereign,unsolicited, we saw our head waiter nightly and he was fastidious in making sure we were happy. Only saw our head waiter the first night on the Magic and was not seen again. Dining room service on Sovereign(and Radiance too) was similar to Palo on the Magic,but you didn't have to get a reservation every night. Also we did not get the nightly "excellent" speech etc,it was only mentioned the last night that to fill out the cards is very important.
The adult lounges were larger and had a better variety of musicians. Shows were not just cabaret shows. I remember one very funny comedian. Also the adult lounges had some great views.
Rooms are definitely smaller as it is an older ship. Also no characters or Disney shows. Movie selection was less.
With less kids on board (though there were kids)I did not see the little boys having spitting contests off the deck next to me, nor the nightly tantrum the little girl at the table next to ours would have- and her parents would just sit there. Noise levels in the dining rooms was significantly less.I don't think these things are romantic,LOL.
So I guess my point is twofold. First,do not dismiss the older ships as you can have a very memorable cruise. Ours was excellent. And in some ways better than the Wonder. Looking back on our cruises we had a great time on all -for different reasons. I actually liked Radiance and Dawn better than the Magic.,Sovereign about the same- for different reasons. Second,if I were to do an adult-only cruise and looking for romance as the OP stated,I would choose another line over
DCL,and yes maybe even Sovereign an older ship.