About Materal:

Vinyl is a very suitable material for printing, because the color is the most bright and vivid. This material is light, non-waterproof, slight diaphanous, which is suitable for indoor use. It's thin but cheap and cost- effective. (Vinyl can only be ironed with a low-temperature iron. )
Poly is more professional. Its material is very good. It is waterproof, can also be ironed with an iron, and can be used repeatedly, and the fabric is stronger.

Advantages And Disadvantages:

The vinyl material will slightly affect the shooting effect due to the crease of transportation. This requires the buyer to use a low temperature iron to remove the crease.
The polyester will not crease. It is also stronger and can be used repeatedly. Can be washed with water.