The iWork apps can create documents that will open in their respective Office counterpart, however, there are certain special features in both iWork and Office that don't translate to the other very well. As long as you stick with fairly simple/plain documents, you should be fine. Once that works well for you, you can then try creating more complex documents just to see how they translate and alter the result as needed.
I like to reask the qustion in context of current situation.
It means as it applies to Numbers, Pages and Keynotes as delivered with
sleek new mac stations today.
Are these three same powerfull as the suite coming from Microsoft, Apache Open Office, Libre Office?
Please read the term 'power' in assimilation with set of functionalities.
Which of the three non-Apple suits deliver currently the best trade-off of stability and performance
if run it on Maverick?
Is it a better idea in case of any of them (MS, Apache OO, Libre) to run on virtual machine
due to stability issues?
Sorry, a small notice from me.
Availability of Mac version does not yet mean good stability, or acceptable performance.
There are mac users who claim the Firefox - for instance - had significant
stability/performance issues on os X.
Stability and overall integrity is highly important. I am not ready to pay the
price of system crashes, troubleshooting and so on.