I m using using Mi products regularly and according to me output sounds are quite similar to Xiaomi note 4 and the handset is user friendly as it comes comfortable in our hands screen size or tge display is little smaller than note 4 but it provides all that features which is in note 4 and look are classy and it gives great feel in our hands it is the best value for money item I would say but but the one difference as I told you is .
The only difference is the processor in both the phone
In redmi 4 its works on 1.4Ghz octacore Qualcomm Snapdragon 435 processor and on the other one its works on octacore 2.0Max Snapdragon 635 processor which may lead to low performance in some cases like high gaming .
Thank you