You should talk to each PNP about their immigration classes and processing time. After getting your nomination, the PR application part will be the same. As far as I know, neither province requires you to stay in the province for a certain amount of time for most immigration classes although investor class may be dependent on you investing in and running a business in the province. I know that Manitoba now has a clause in their family sponsorship that you can not sponsor a family member if you previously sponsored a family member who did not stay in the province.
However, also important if you are not planning on staying in the province at all.. immigration is now going after PNP applicants who they believe have no intention of living in their PNP province. Some people have had their PR visas cancelled as they wanted to land and others have been given their PR but reported to their PNP to check up on them later. If you are found to have misrepresented yourself by lying about your intentions, you may lose your PR.