Slightly off topic, but as you are talking about seats on the aircraft then it is probably a good idea to pick a good one because while you are at DXB you will have a very long time to stand around!
That place is so packed now that it is impossible to sit down anywhere - the place looks more like a doss house than an international airport. Every inch of floor there are hundreds of people sleeping, it really does resemble a shelter and not a very good one at that.
No matter how great Emirates are, what is the point of flying with them if your journey is ruined by that airport - the place is just too stressy and manic.
It has surpassed Heathrow as it is now widely referred to as far worse!!!