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There are essentially 2 kinds of vinyl flooring: glue down and click. Most people choose the click as it's easier to install and remove.
What is super important for all flooring installations is a smooth and level subfloor, and this is particularly true for vinyl. Thinner vinyl will bend and shape itself to bumps in the floor and crack over time.
The other thing to note is that the click system is the weak point in the floor, as it's only half the thickness of the floor itself. This is where a thicker floor matters most. Not only will a thicker vinyl offer you more comfort underfoot and noise reduction, it will also come with a thicker click mechanism, which will offer more strength and durability.
Another important thing to look for is the wear layer, which is the clear coating on top of the vinyl flooring. Cheaper floors have an 8 or 12 mil wear layer which will not stand up to heavy traffic. Look for something with a 20–22 mil wear layer to ensure that your flooring can stand up to normal wear and tear and last for years. Patterns, colours and textures are almost endless when it comes to vinyl flooring, but it needs to look good AND last for it to have any real value.