I would say that the BR songbooks are really good... my reasoning is that I read somewhere that James Gray himself wrote them out.

But since he's no longer a member of the band, the latest albums haven't been done by him.

As for the the other tabs that you've seen that aren't close, they're often done by outsiders, and therefore the care and the accuracy is not necessarily what you would get from a member of the band, or someone who prides themselves on their accuracy.

And I simply don't have the time or patience (or compensation ) to do full piano notation for these songs.