Your verandah in those 6000 rooms are not going to be rectangles; they will have a slight angle near the rail. Some people with OCD would be bothered by this.
The interior area below your cabin (Deck 5) is a hallway and balcony seating for the Luna Lounge on Deck 4.
Cabins 6072 and 6074 should have the deepest verandahs - and the most wide angle view of that row.
I would go up to 8, so I wouldn’t have the lifeboat directly under my balcony.