Since I'm a pretty renowned pig rassler, let's look at this a bit.
discs aren't for overseeding.
First, no one here has ever said a disk was designed for overseeding. So you can let that go now.
not the first, second, or third option in anyone's book.
Second, the OP did not ask for a list of options. He mentioned three tools and asked which one would serve him best. So let's not confuse things by suggesting that any of the members here who are far more knowledgeable than me have argued that any of the 3 tools mentioned are designed for or are perfect for the task mentioned.
Third, as far as 'anyone's book" you are simply mistaken. Very smart and very experienced people have already explained to you how they and others have used a disk in this sort of application.
You asked for sources, and you were given them. You ignored them.
You should be. You're making claims that you can't support with any evidence or experience.
don't make this guy wasted his money on seed and follow your ill advice.
We are not going to "make" him do anything. We have given him advice. We have supported it with data, sources and a wealth of experience (not mine). He can make his own decision, and wisely, he seems to be ignoring yours. There is a chance your advice might have some validity, but so far you have done nothing to support it. And why would he follow it? He doesn't know you and you don't seem to know what your're talking about and your avatar is a picture of a communist guerilla. What about you, that we know, makes your pronouncements worth anything?