Kill Confirmed. I really like it because it is satisfying picking up tags and if you are good, it's a great game mode for ranking up. You can earn alot of points playing Kill Confirmed.
Domination is very nice because I know where the enemies are spawning. Out of the newly introduced modes, probably Drop Zone for it's easy kills. I don't know about Kill Confirmed because it's spawns are so sporadic; There was a GWK today while I was playing it and my team mate literally sprayed 3-4 enemies as they spawned in the same spot.
Domination is the standard for me, but drop zone has caught my eye in recent months. I just wish it was more competitive, whenever I'm on it is usually half the team playing objectively with 2 never once getting on a drop zone and one guy trying to trick shot for his youtube. Sure, killing the enemies before they get to the drop zone IS important but you can totally do that from IN the drop zone. nawimsayin