Could someone give me some advice because I'm really confused? recently got a Royal Python and its my first ever as I've only owned a corn before, anyway my Royal is currently 1 foot and 20 inches and she's in a plastic box which measures 1 foot and 17 inches, and it looks really tight, so I rang 2 reptiles pet shops and one said I should keep her in that and the other one said it wouldn't hurt to put her into a 3 foot vivarium as long as I packed it with plenty of plants, hides and logs.

Which one is the right advice?