Since WiFi is 802.11 b/g/n the approximate range is above 4 to 5 meters only, the WiFi speed is approximately 4MBps, which is common for all devices having price below than 10,000 Rs.
About camera which is 5MP with auto-focus and one flash, it's pretty good and gives average quality of picture, the clarity of image is not so sharp for detailed view but micro photos can be taken better from it's camera, Redmi 1S and Xolo Q600S have better camera image quality than Unite 2.
Most budget mobile does not provide good and long lasting battery quality, but battery of Unite 2 is at average level with Li-Ion 2000 mAh battery with Stand-by time Up to 190 hand Talk time Up to 8 h.
For me Unite 2 is not a better phone as having display density of 199ppi which is too low and bad for viewing images, videos or whole user interface because every pixel can be seen easily.
You can go for Moto E(Rs. 5,999) < Android One(Rs. 5,999) < Redmi 1S(Rs.5,999) means Redmi 1S is better than all the phones under 8,000 Rs.