Looks like we'll be a dissenting opinion here...
We were just down at the world in late September and ate at both places. No question, we'd recommend Rose and Crown over Marrakesh. The Marrakesh food was acceptable, but not outstanding. We had the Royal Feast, which included both chicken and lamb. The lamb tasted a bit muttony to me, and the flavors in the chicken stew tasted a bit dull. Appetizers and dessert were good. The restaurant is beautiful, as people say, but quite brightly lit, so it did not seem romantic to us. There is a belly dancer, but she performs for less than 5 minutes (one dance) accompanied by some live music (quite good). The tables were quite close together and although we were fortunate in that no one was seated immediated next to us, the waiter's butt would scrape across out table as he tried to shimmy between tables (maybe they were 6-8 inches apart). The ceiling was also dripping unobtrusively onto the table next to us, which did not make the best impression (there were literally a couple of dozen empty tables, so no need to have seated us so close to a drip-- not that it affected us other than making a poor impression...).
Rose and Crown was our surprise second favortie meal of the trip (second only to the California Grill, so that's saying something). There were three of us at this meal and everything we had was excellent. Mushroom appetizer-- fabulous! Cheese platter appetizer-- stupendous! Lamb soup-- three thumbs up! Entrees were just as good. Steak and chips-- mmm, mmm good! Curried vegetables with chicken-- vibrant taste, crisp-tender vegetables, excellent! Cottage pie-- what can I say? not one molecule survived my husband's assault. We were too stuffed to really enjoy dessert but did order Guinness cake and apple crumble-- the few bites we could manage of each were quite good, especially the Guinness cake. It was a lovely evening and we sat outside on the patio, dining by moonlight next to the lagoon, so the ambience seemed much better to us than Marrakesh with its bright lighting and dripping ceiling! Our waitress was lovely and funny, as well, and never once ran her butt across our table!
So this is just one other set of opinions to go by. I doubt we'll go back to Marrakesh, but we actually did consider going back to Rose and Crown a second time in that very trip. I would definately work it into my travel plans for future trips!
H