Camera Quality:
Nokia N1 gives more camera power compare to Nexus 9. In Nokia you get an 8MP back and 5MP front camera. You can take good pictures and also on the same hand you can take nice selfies. But in Nexus 9 you get the same 8MP camera on the back but the front 1.6MP is less. The quality might not be great for video chatting and for selfies.
When it comes to rear camera you can get a decent output from both. You can take good photos and you can also share them instantly. But when it comes to front camera things get limited in Nexus 9. So if you are buying a tablet and want a good front camera, than keeping a eye on Nokia N1 will be better choice.
Storage & Cost:
We are on the final part of comparison now. The storage. Nokia N1 comes in a single 32GB version. There is no other variation available. And you will also get an expansion slot for the same. While Nexus 9 comes in two different version. One here is 16GB and the other one is 32GB. So you are having choice to go with lower one that will be a bit cheaper one in the cost.
If you go with Nexus N9 then of the 16GB version you have to pay Rs.36000 and for the 32GB version you have to pay Rs.42000. And compare to that. Nokia N1 lies around $249 in international market, which makes it less than Rs.20000.