I would hope so. I have been using the x64 release as a production server since it has been available.
Honestly, I don't know what would make the x64 better, I just know with Windows systems, x32 has limitations that x64 doesn't have. So I figured if my server has 16gb of ram, it is best for me to use x64.
I'm pretty sure someone will tell me that's not right, but aside from that, x64 works great, and I have LOTS of contribs installed.