SLF3, in a way, your answer poses the question! What is the best seat? Do you prefer:-
- Capsule or sharing?
- Facing the window or inward?
- Do you tend to sleep or work?
- What body size/shape are you?
- Is the food important - best seat might not have best food!
- Is the service important - best seat might not have most attentive service!
- Is it going to be a daylight or night time sector?
- Are you going on a work trip or leisure?
- What is your cultural approach to travel?
There might be four different 'best' business seats and they might be four different carriers or just two. There is no best - except for you.