The DSS vs Masoretic

The DSS vs Masoretic vs Samaritan vs Septuagint vs Aramaic Text, which is right?
There are a number of anti-missionaries like Toviah Singer who have accused followers of Yehoshuah (Jesus) of altering texts that prophecy of The Anointed One. But the Dead Sea Scrolls, as well as some other manuscripts, indicate that it was the Masoretes who changed the TaNaKh so as to discredit the Nazarene (early Jewish-Christians) movement.