Both are acceptable. The police verification will be done by your local police station only in both the cases. Also, releasing of the PCC is again with the Police not PSK. Check which one is taking lesser time and apply for it.
The principal applicant should link the application. You can follow this to do that:
https://www.canadavisa.com/canada-immigration-discussion-board/threads/how-to-link-an-application-to-cic-account-step-by-step-instruction.619724/
Well, immigration officer too is an adult and must be aware of many ways an immigration fraud can be done. So, it is better to provide an explanation on the questions they have asked.
It doesn’t matter about the percentage because the immigration for Canada in India was on halt for many months, but the ETA bar in the GC key was not stopped.
You didn’t tell how many times have you traveled together?
Also, who visited whom and how many times before and after marriage irrespective of travelling together?
Have you traveled with your spouse? If yes, how many times before marriage and how many times after?
Also, who visited whom and how many times before and after marriage?