Bud, what is your preference brand for tilebacker product?
I've used them all over the years of course.
Of the traditional grey colored cement boards I always preferred Permabase. Permabase always seemed to me to have superior quality control in their finished product and the tapered edges were always consistent in shape and size.
I also have used a lot of Hardibacker and actually prefer it over the Permabase, again because of edge consistency.
Then a few years ago along came the Green-E board which is what I have progressed to. Green-E is lighter weight than the others and it truly does cut as easy as drywall. It is white in color but green in construction.
And...according to the maker you can staple it (using the correct staples and air adjustments) to the substrate.
Those are boards. The absolute best tile underlayment to ever come down the pike is Schluter's DITRA. When I can cover the cost DITRA is my choice hands down.