I read that also. Both is an option.
There are legitimate advantages to 64 bit. And every major audio software company out there has realized this. Also, since BIAB runs 100% in memory, 64 bit will speed up everything. Especially VST. Here's a quote from Microsofts site. "The 64-bit version of Windows handles large amounts of random access memory (RAM) more effectively than a 32-bit system."