The format of the QVW file is compatible with both 32 and 64 bit versions, so it doesn't matter how you create the file. I'm using a similar set-up, as I would presume most shops are.
The QVW file is also compatible with older versions (7 -10), but newer components would not be available. So you could upgrade you server and developer clients independently.
The primary advantage of running a 64bit server version is increased performance and memory handling.