Now correct me if I am wrong, but as far as I know it is like this:
wine is open source, no gui. Not so easy to install and use, needs a little skill to get it working. It is free. It is done by the nice and powerful people of the community.
Crossover office is closed source, based on wine, basically the same as wine, but with a nice "click click click" gui that is very easy for everybody. All the changes (and advancements) from cross over office are put back into wine (which is only fair, since they build it on it). It is not free, costs around 50$ or something. It is done by a company called codeweavers
http://www.codeweavers.com
Anything you can do with crossover office should basically also be in wine, but as said before, wine can be a pain to configure, especially for newbies.
But as I always say: either you got it in the head or you got it in the wallet. ;-)
cheers
Markus