It depends on whether a physical qwerty matters for your usage.
If you're typing heavily, & can put up w/the slight inconvenience of a small BT keyb, then no built-in is irrelevant.
At that point the many (mostly small, but not all) advantages the N9 has come into play.
Some of which you have omitted, or seem to be unaware of...

I own neither, I've simply researched both heavily over a long period.
And I've been following everyone's observations/experiences closely.