Pivot doors are extremely popular due to part of the door pivoting back inside the shower tray, this makes the door far more practical and creates less obstruction inside the room.
Depending on your available space a door that folds may be better for your bathroom.
On a bi-fold shower door, the door consists of two panels that concertina together when the door is opened. Whilst one end stays in a fixed position, the other runs along tracks allowing for access.