With bags checked through to destination, you'll arrive with just hand luggage, in F you will be met at the gate with assistant on a buggy. Its easy to do plane to chaufeur drive car in less than 30 mins. My record is 16 minutes. Allowing 20 mins to a hotel in Deira you could easily be in your room 45 mins after landing. It really does break up the trip. Although it seems you are set on staying airside, so thats individual choice.