Build Quality
Well Nokia is known for its best and long lasting build quality , and Nokia 6 is also one of them, Nokia 6 comes with aluminium unibody construction, which is more tough and more long lasting than Redmi Note 4. Redmi Note 4 is not that good in terms of build quality, many usera reported that its paint or color is removing from back side. If you want to buy a better build and long Lasting Smartphone then Nokia 6 is the Smartphone you should buy between these two smartphones.
Performance
Coming to the performance , well both smartphone comes with Qualcomm Snapdragon chipset but it is the Redmi Note 4 which gets better chipset i.e Snapdragon 625, which is much better than chipset use in Nokia 6 Snapdragon 430 .If you want to buy a powerful smartphone between these two smartphones then Redmi Note 4 is the Smartphone you should buy.
Camera
Well Nokia 6 comes with 16MP Rear and 8MP Front facing Camera and Redmi Note 4 comes with 13MP Rear and 5MP Front Facing Camera, Camera quality donot depends on number of mega-pixels , it is dependent on sensor and size of aperture and Nokia 6 comes ahead when it comes to camera test , when test it out at the launch event of Nokia , we take our Redmi Note 4 at the launch and we compares both the cameras and we found that Nokia 6 camera is more sharper and much better when it comes to artificial as well as daylight conditions ,also we found that Nokia 6 captures images very similar to the natural colours of the objects. If you want much better Camera between these Smartphone then Nokia 6 is the Smartphone you should buy.
Battery
Battery is the first preference for many users , almost everybody wants a smartphone that will give them a full battery backup of one day well both them will give you battery backup of almost one day but Redmi Note 4 will give you much bettet battery life than Nokia 6. If you want to buy a smartphone that gives you good battery life between these two then Redmi Note 4 is the smartphone you should pick for Yourself.
Software Experience and Android Updates
Well Nokia is now aiming to give users best software experience and HMD Global also sure that Nokia Smartphone will get every Android Update,At the time of launch we also feels that Nokia 6 software experience is much better than many smartphones above its segment and you will also get timely android updates. If you are that kind of person who want to be updated everytime when new Android comes out then you should buy Nokia 6 for yourself.
Availability
Well Both the Smartphones are available through Flash Sales, And Redmi Note 4 was launched in January 2017 but it is still not available to buy easily,Well Nokia’s every mobile phone is a hit in Market from past and Nokia makes it available to buy their Smartphones to buy by large number of people and we think that Nokia 6 will be more easily available then Redmi note 4 in July.