Vice Versa or LandMarc for 10?
I've never been to Vice Versa, but I recently organized a group dinner for a party of 12 at Landmarc and it was great. The dining room is really spacious (with a great view of the park) and they seated us in one of the back sections behind a wall, so we felt as if we had our own private room (though I think there's an actual private room if you're interested). We were there for over 3 hours, but they never rushed us (have to note that our water glasses remained empty for the last half hour or so, however), and the food was really good. Everyone who ordered the steak loved it, and I really enjoyed the lamb shank. The dessert flight is also fun to share with a group, plus they give you cotton candy!