Ahh....lol I suppose I am confusing the two. I use Office out of necessity at work, in that I'm pretty locked down. If I had the choice, I'd use my mac for everything and would probably be fine with iWork. Since iOS7/Mavs, the compatibility issues have disappeared. Really impressed with the improvements.
I'm still trying to figure out some way to legitimately use the collaboration feature on iCloud.....but I don't really have any need to. I know Google Docs has had that feature.
So let me ask you this - have you used both Office RT and iWork for iPad? Can you compare the two? I've only used traditional Office.
I do have to say that compatibility between the two has improved, even if it did come at the cost of OS X having a temporarily weaker version.
Now to compare iWork and Office on RT. Well, okay, I can't do it completely. I spent 10$ on Pages for the iPad, but never got around to buying the other two. So I can really only tell you about one of them.
Word and Pages both technically get the job done. Word on RT isn't really missing much when compared to Word normally. Add-ins, macros, and third party software. So, with that said, the differences are minimal. There are some things that are different, of course.
I happen to like the grammar checker of Office. The spellchecker is really too notch. There are also a lot of automation things, helpful things that are missing in my opinion from Pages as a whole. Title Page addition, making a bibliography or a works cited page, easy citations with the click of a button after you put the information into their tool. It's the small things, ya know?
The main thing you have to realize is that Office 2013 between normal Windows 8.1 and RT share a large amount of functionality.
That isn't to say that Pages isn't good, it really is, but I find Word to have a few things that I wish Pages would have as well. Mostly things that are my lazy wants, but what can I say?