Everyone has different experiences. My TU report is the most accurate. My EX report is accurate with two exceptions both of which are helping me to a small degree. They are listing a car loan that I took out August 2002 twice. They have a drop off date for another car loan which is 7 years off. EQ is by far the least accurate for me. They have deleted 6 old tradelines too early. Some have another 3 years to run some as many as 5 years. Now I know they are not obligated to keep closed tradelines for 10 years butif the others can do it why can't they. I wonder if the computer arbitrarily deletes or if they have some dude with a bad tude that takes delight in carpet bombing my credit report working over there at EQ? 
TU has a tendency to lose inquiries early, so I certainly wouldn't say that they're usually the most accurate. The most consumer-friendly, perhaps. 
EQ loses inquiries, although not as badly as TU. EQ is terrible for no longer reporting closed accounts long before 10 years after closure.
Experian has been the most accurate in my own experience.
But it's going to vary for everyone.
