Laserjet 9500 or Laserjet 9000 for printing lots of black A4 sheets?

[printer]

Both Color Laserjet 9500 mfp and Laserjet 9000 mfp are available for an equal price. I need to print lots of black and white A4 sheets (10.000 + each month).


I see that the Color Laserjet 9500 has cheaper original refill. Why is that?
Color Laserjet 9500 has half the speed. As I have big print jobs with around 3.000 pages once where everything goes to the stapler it does not bother me.
But does the 9500 paper jam from time to time? I read about this.

[redcow]

They are both laser printers....they jam from time to time.
The 9500 is colour and s-l-o-w.
The 9000 is monochrome and fast.
If your looking to print black and white, why in gods name would you want to spend the extra money for parts, maintenance kits, toner, and repairs? The speed difference is definitely noticeable.
Be wary of cartridge refills.