Ubuntu 12.04 LTS 32 or 64 bits?


I have been struggling to make gnu radio with gr-baz work on a unbuntu
No success.
As I saw that most of the people who made it were on ubuntu 12.04 I
decided to restart from a clean installation. I was just wondering wich
one should I choose: the ubuntu 12.04 LTS 32 bits or 64 bits???
I have basics knowledge in ubuntu, I just want increase my chance to
make it work by choosing the right distribution… thank you for your
awnser guys.