This post is about "Surrender". I have never before used "Surrender" for several reasons and I'd like to ask for some help in understanding.

This post is about "Late Surrender". My reading suggests that "Early Surrender" is only available in a very tiny number of casinos in North America.

I've been reading two books that explain Surrender. They are:
1) "The World's Biggest BJ Book" by Lance Humble and Carl Cooper
2) "BJ a Professional Reference" by Michael Dalton.

The WGBJB describes Surrender as follows: (pg 35 and 400-404)
1) Surrender enables you to stop play on any hand where DLR doesn't show A and get back half your bet.
2) Most casinos only allow SUR on first two cards.
3) It's not worth learning complex rules for 3-card Surrender.

The main problem I'm having is that the charts provided for Surrender are very different for both these books. I'd very much like to ask if one of these book is generally regarded as closer to the reality and if so which one is it?

Some of the main differences are:

Although TWGBJB implies you can only surrender if the Dlr is not showing an Ace, both books provide many examples of when you should surrender when the Dlr is showing an Ace.
For example TWGBJB states you should Surrender when holding T,6 vs Dlr's A. But the Pro Ref book gives six examples of when you should surrender when Dlr is showing an Ace. They are:
T,5 T,6 T,7 9,6 9,7 7,7 v A
On page 192, the Pro Ref book says you should only surrender when Dlr shows an Ace if the Dlr always hits a Soft 17. TWGBJB never says anything about the Dlr always hitting a Soft 17.
Also, the Pro Ref book states you should not surrender 8,8 v A in a 2 deck shoe.

These are just a few examples of the differences between these two books. But, there are a great many differences between the strategy tables regarding Surrender for these two books.

Can anyone please help me makes sense of this? I must not be understanding something here. Or is one of these books just wrong? Or maybe both of them?