A lot of it depends on when we board the ship. If our staterooms are not ready and I'm hauling around a backpack, I'm definitely going to a sit-down restaurant. If I'm able to drop my bag in my stateroom, I might go to Cabanas/Marcelline Market. There's definitely more selection, and at that time (post 1:30-2:00), it's probably not as busy. If I'm not very hungry, I'm also more likely to go to the buffet since I can get smaller portions.
On our recent Wish cruise (Jan 30), we were staying with friends in Tampa, and we all drove there. Had to leave at 7 am so by the time we boarded just after noon, we were starving and all had our carry-ons with us. We went to Arendelle for the sit-down lunch. If I wasn't as hungry, I probably could have just ordered a couple of the appetizers/soup/salad, but we were hungry, and the sirloin was delicious. So although there are fewer options than Marcelline Market, it worked out perfectly for us. We lingered for a little while, then wandered the ship for a bit, so there wasn't too much time we needed to wait to get to our rooms afterwards.