Normally your VO would be whatever you specified on your application. If you want to change that you can contact the CIO-Sydney, where I assume your application is. If you have got your PER, then there is a bit of uncertainty.
Both CPC-O and NDVO seem to be fast, so unlike others e.g. who are under SGVO, you don't have much motivation to switch the VO. However if you are going to be in Canada for a while, you should switch - I think. At some point you would have to submit your passport. Since you are an Indian, you cannot send it out of the country i.e. Canada. So you might as well switch it now.