The reality is that there are advantages and disadvantages on both sides of the question. I do have a preference though, and that is for poly twine over wire. The main reason for this is that the poly twine is much easier to work with. It cuts with a knife. It doesn't cause damage to my tools (or me personally) if I mistakenly hit it with a chainsaw, etc. It is soft and flexible, yet strong. It really makes everything easier.
Wire ties on bales have one distinct advantage over poly twine and that is that they make the bales incredibly tight. The baling machine is able to get the bales much more dense with the metal ties so the uniformity of the bales is improved as well. If you don't plan to modify the size of many bales in your project, then perhaps metal ties are the way to go.
If you are willing to work around the potential danger of using wire and the hassle of retying bales with it, then it could very well be a good match, especially if wire tied bales are what are most readily available in your area.
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Jumping back to poly twine, it's important to note that not all twines are created equal. There are several different grades of poly twine meant for different uses. For example, there are very thick twines which are designed for use on jumbo bales, and there is very thin twine which is primarily used for flossing teeth (just kidding, but it is too thin to use for straw bale construction).
Making sure you have the right twine is important. As noted, the thin stuff is no good for baling a house; however, neither is the big stuff. It's too much like working with rope. My preference is for "super blue" (my name for it) twine. It is designed for use on three string bales and is both strong and easy to work with.
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