It really depends on the space that you have in your home.
The fold-up legs are very convenient because they allow you to store away your bellicon quickly and easily. So if you have a smaller space, or you plan to store it away when not in use, the folding legs are a must-have.
But, if you plan to keep your bellicon set up in one spot, and rarely move it from the ready position, the screw-in legs would be a great option. If you have the space, it is always best to put the bellicon in a place where it is ready to use and very visible. This will help to encourage you to use it often. Remember: out of sight, out of mind!
Both type of legs are equally durable/sturdy and carry the same (lifetime) warranty.