I'm going to have to travel SEA-JNB for work the week of March 2nd, and I'm looking for recommendations on which AS partner airline to book. Have some price flexibility but will need to book economy. EK looks to be both cheapest and offer the most miles flown with route through DXB, but reviews of their economy seats on 777-300ER aren't great. How does EK economy compare to BA, AF, DL? Are there any specific mileage promotions I should be aware of?

Open to all thoughts/suggestions. Thanks!