Both trains are good.For GR catering by Vendors is available on board from Vendors or else you can pick food from VSKP station itself..Soon from September onwards the Duronto timings are going to change shall depart from VSKP @ 8:15 PM and reach SC by 6:16 AM,so chances of food in that also could be available from vendors..Choose the one which suites your timings most. Guess Food shouldn't be a issue which can be picked from VSKP station also for both trains.