The minimum connect time at Dubai is 75 minutes, so you should be OK.

There are 3 (or is it 4?) security transit points. If there is a big queue at the first one, carry on walking, and you'll usually find that one of the others is nice and quiet

Note that you won't be able to choose exit row or bulkhead seats online. These are only allocated at the airport, where the staff can confirm that you are able bodied. So, try and get to the airport extra early if you want a good choice of seats.

Cheers,
Rick