A.
Both have their fair share of advantages and disadvantages
Chances of theft: Parking Permit Stickers are less likely to get lost or stolen because they stick to the outside or inside of the vehicle’s windshield, bumper, or mirror.
Easy to Install: Parking Permit Hang tags have a special cutout that easily fits over any rear-view mirror of the vehicle, whereas parking stickers take a little more time and effort in installation.
Driver’s visibility: Hang tags are more likely to block driver’s view than sticker permits. Stickers even come with a clear background for more light to pass through them.
Transferability: Hang tags are easily transferred from one vehicle to another and can be removed for added privacy and security. Stickers, unless they are the cling type, cannot be removed.
Durability: Good quality stickers are durable, tear-proof. Hang tags made of thick plastic won't warp, fade, or crack.
Ease of Verification: While some parking staff members may find it easiest to visually verify a sticker on the vehicle, others may find it easier to glance at the rearview mirror as each vehicle enters the lot.