4021 pullup or pulldown best practice?

Other Hardware LEDs and Multiplexing
1

So I'm using a 4021 to register multiple button inputs. I currently have the buttons between 5v and 4021 inputs with a 10k pulldown resistor on each input of the 4021. (normal pulldown resistor setup) It works great.

But....

I know that in general it's preferable to use pullup resistors on inputs. But in the case where the inputs are running into a multiplexer like the 4021, and not straight to the arduino inputs I'm having a hard time understanding if it really makes any difference...

So, does it make any difference? And if so can you explain why?

Thanks!

2

I would always pull up.
See
http://www.thebox.myzen.co.uk/Tutorial/Inputs.html
In your case you need less current to pull up as well.