Haven't been on the Triumph, but would think experiences are similar on all Carnival ships. We like to eat breakfast in the dining room. My husband likes to have sit down service. I am not a big breakfast eater, but I like to order baked apple (not available at the buffet) and oatmeal. There will not be too many people in the dining room so you may not sit at your regular table. You may be seated with other cruisers, so you can meet new people. There may be only one dining room open during breakfast, check your capers. On port days and debarkation day, the buffet lines are usually very long (although they go quick), but the dining room will be peaceful, as usual.
It's just a different experience. Just try it and see if you like it.