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The best way to update any phone is to wait for the official release of the OS from the brand itself.
Samsung has promised the Android N update for Galaxy C7 Pro and Galaxy C9 Pro both so its better to wait for the official update to roll out.
However most of the time you will receive the update notification automatically but you can check it through this process manually:
To check the new update you can follow this process:
Go to "Settings"
Scroll down to "System Updates"
Then click on the Check update manually
and then let it complete the process
The second way is to root the phone and install android N based custom ROM in it.
Here is the video showing Step by Step process that how to update the Phone to Android N:
You can find the specs here: Samsung Galaxy C9 Pro
Both the phones have their pros and cons, I think you should go for Galaxy C9 Pro. Galaxy C9 Pro has the following advantages over Galaxy A9 Pro.
It is not like that it is a one sided game, Galaxy A9 Pro also has the following advantages -
Verdict:- Galaxy C9 Pro has an edge over Galaxy A9 Pro but it is priced relatively higher than the Galaxy A9 Pro but considering the performance drop of Galaxy A9 Pro at a much lower price Galaxy A9 Pro also has its own charm to buy.
You can compare this on our 91mobiles link:Galaxy C9 Pro vs Galaxy A9 Pro
You can also check this video comparison