<p>I recommend Office. You're probably already familiar with Office, so it doesn't make sense to have to learn a new interface. iWork's interface is really quite different from Office (yes, the Mac version of Office does not have the same interface as the Windows version, but it's really quite similar. iWork is nothing like it). While iWork is relatively compatible with Office, I have never had a problem with compatibility between the Mac and Windows versions of Office. With iWork on the other hand, I have the occasional differences in formatting, fonts, etc. </p>
<p>Regarding PowerPoint and beauty: I would not say that Keynote creates more beautiful presentations (with the exception of more elegant and less cheesy transition effects). What iWork does have are different templates, which look more appealing because they haven't been overused like most of the templates in the Windows version of PowerPoint. </p>
<p>Here's something that kevdude did not mention: Excel. iWork has a new spreadsheet program called Numbers. I have not personally gotten a chance to play with Numbers (I have an older version of iWork), but from what I have read, it's great for basic usage. However, depending on your major, you may need a more advanced spreadsheet program or specific Excel features, in which case Excel is your best choice.</p>
<p>Finally cost. OIT offers Office for Mac for $45. iWork, with educational discount, is $71 from Apple (although, like Mac OS 10.5, you might be able to get it cheaper if you ask for it at the OIT store on campus).</p>
<p>In the end, it ultimately depends on what you need from your office suite and if learning your way around a new interface (which some say is ultimately easier to use than Office) is worth your time. The best to do this is to try both. When your Mac comes, it may (I don't know if they still do) come with a trial version of and iWork. I'm assuming you've used Office before, so you should already have some idea of how that works. Try out iWork, compare it to Office, and choose what's best for you.</p>
<p>If your Mac does not come with the trial, you can get a trial of iWork here:
Apple</a> - iWork - Trial</p>