@Karcheer
Hard choice, so I can see why you are asking.
Given you can't swap the downstairs/upstairs, then I would actually go with A because the upstairs is better. The downstairs on A is fine (B is better though), but I am not sure about the split dressing room upstairs in B.
Is this a self build or new build?
Looks like a new build development - the floor plans look very familiar to the ones my developer presented for 5 bedroom houses. Have you seen the show rooms? If the show room is one of the floor plans then that might help.