Compare to redmi 3s prime only frew things are changed in redmi 4 .
design : redmi 4 has premium design with 2.5d curved glass
processor : 1.4gh octacore sd435 ( sd 430 in redmi 3s prime)
camera : same lense which present in redmi note 4 camera. 13 and 5mp
pros:
1) price
2gb + 16gb - 6999/-
3gb+ 32gb - 8999/-
4gb+ 64gb - 10999/-
2) great design
3) 4100mah battery
4) good camera
5) ir blaster
6) 4G volte
7) android nougat 7.0 peview os
8) fingerprint sensor
cons:
1) 720p hd display for all 3 varients
2) no fast charging
3) hybrid slot
4) online flash sale
5) no screen protection ( no gorilla glass)
one of best value for money budget mobile in 2017