I have a 5E booked in December, so I may be biased (although I have never sailed 5E before, so maybe not)
I would take the 5E GTY.... you can never be placed in a "lower" category than your GTY Booking, so either you will get a 5E or a 4#... No point in booking 4C when you might get a 4 anyway... unless the price is the same.
The advice everyone gives on here is to always book the lowest category that you will be happy with. That way, if you get the one that you booked, you will be a happy camper (or cruiser, as the case may be) and if you get an upgrade, *bonus*!
Just my opinion. No matter what you do, you're still on the Disney Ship, the happiest vessels on earth
Have a magical trip!