Why Guitar teachers use different tabs for one song? is there a way to do that? sometimes I saw two or three tabs for on song:easy and difficult...
I've used multiple tabs when teaching before almost always because neither of the tabs is correct, but one tab might be better on the chorus and the other one is better on the verse, or something like that.
At first, I would re-do the songs in Finale to try to make a more accurate, complete tab, but it took too much time. Another skill I wanted to teach my students is how to research and learn music on their own. Sometimes I would assign tab research as homework and we would talk about how the tab(s) they found didn't seem to sound right when played.
Even professionally transcribed tabs are not always right. The best invention for learning how the original artist really plays a song is YouTube, which I have relied on many times to get accurate fingering and fret positions.
Playing it in the exact way as the original artist often makes it sound more authentic, but the real value in it is the educational aspect. When students look up to an artist, that's an opportunity to encourage them to learn a technique that might otherwise seem boring or unnecessary to them. Sometimes all you have to do is say, "Well the guy in Muse plays it this way", and they are off to the races.
Different tablatures may contain more detail on instruments, and more difficult plays, which include techniques that require more skill and/or practice to do well.
Let's say one tab is just chords, you just need to remember chord shapes and you can play it, while other offers actual notes of solo parts that can't be described by chords only and you may need to have quick agile fingers to play it well. And also, everybody may hear different notes when transcribing to tabs.
Sometimes a student cant play a song as it was created by the author. A way to achieve proficiency is to start a light version, simplified as a preparatory exercise. I advise never invest your time in boring dull mechanistic repertoire --- you should form a good playable and performable repertoire as early as you can. Many years later you`ll be a prepared happy performer then...However it is a subjective choice. For beginners, I advise guitar songs by Shadows, Ventures, Nirvana and Santana and lute Renaissance music.