If a built-in hw qwerty's very important for your usage scenario, then of course the N950's a good option.*
But that's the only reason why the N950 may be "better", chenliangchen's claims are simply not correct.

In every other area the N9's as good or better, it's been explained to him & others numerous times.
When someone owns a ph, they tend to justify their purchase as much as possible, no matter the facts.

If the OP wants to accept his claims as facts instead of researching heavily 1st, then that's his problem.
Sorry that I can't be of more help, it just gets tiresome repeating the same things over, & over, & over.

*For hard-core typing I tend to use portable BT/USB qwerty's.
They're far better for fast/accurate typing than built-in qwerty's.
But they're not as convenient as built-ins of course....