The kind of pressure you like from your blanket depends on who you are. If you love deeper pressure to give you that calming effect, then you should get the 20lb weighted blanket. It is heavier since it has been weighed with either more beads or stuffing.
It is beneficial if you need intense sensory pressure to calm you down. YNM ensures that the beads in the 20-pound weighted blanket are evenly distributed since a mistake with this can lead to issues with the user.
The one thing you might need to look into when getting this 20 lbs blanket is that you have no injuries or mobility issues. They can be a bit heavy to throw off, and if you are in pain, you will worsen it. Always talk to your healthcare provider if any condition hinders you from using the blanket. It also helps to know your limits so you are comfortable throughout the night.
Because of its sheer weight, this category blanket is only available for adults, not children. Check out the weight on the website before ordering so you do not get this for young children. The weight of the blanket will not affect the quality of workmanship on it, so you do not have to worry about that.