I'm a big fan of my 225 quattro. Haven't had a chance to drive the 3.2, but I do like turbocharged engines. A lot easier to get more HP out of an engine than an n/a (without performance parts that is). A benefit to the 3.2 however is that I believe it has a timing chain while the 225 has a belt which requires service and is somewhat difficult to do. Really comes down to personal preference. I have heard that the 3.2 is less reliable but it is just heresay and I have nothing to back that up with.
Good luck!
Good luck!