Yes either will work fine. What you get with 64bit is access to more
memory ( assuming you have a system that can take oodles of it and you
want to stuff as much in as you can ) plus it allows use of special
64bit routines in the CPU which the 32bit OS has a long-winded work
around to use.

I was unable to use 64bit as the Dell colour laser driver ( actually a
re-badged Xerox Phaser 6000 ) is 32bit only and try as I could it
would not play ball with Kubuntu 64bit. Not too disheartened as the
printer is excellent and using an SSD for the OS means it's pretty
fast anyway so any performance boost would be moot :-)