You can not get wrong choosing the bulkhead seat in the small or bigger cabin of business class.
Make reservation for a middle aisle seat, so you and your neighbour always can leave the seat to the left or right.
The tv-screen is about 15" - very good. It takes some time to learn how to handle the IFE.
If your 345 flight is in the beginning of march, when are you in Dubai?
I will leave for DXB on Feb. 28.