Im interviewing at both...was hired as DEC for Qatar already.
Both have many pros and cons.
The overall package is better at EK. I believe that EK/Dubai is best place for excitement for your family.
However Doha is changing rapidly for the better and has money to back it up.
Qr has been having a growth rate of 35% per year. With 787, 777, A380, A350s A320 all on order. They will take delivery of new airplane every 15 days.
They were voted best airline of the year for 2011.....they are an up and coming airline, with lots of potential
Time to left seat is definitely a factor and I would be willing to bet it is quicker at this point of the game for QR.
When their new terminal is finished I believe it will help them even more as I have traveled through Doha as a revenue passenger....in First class it is amazing, as economy passenger it is a disappointment....7 months from now that will be changing.