Iphone 6s is the best iphone than that of the other series.It has many specific options and those were enough.The size of the 6s is enough and sufficient.It is not as small as 5s and also not very big as os 6s plus.This phone has it’s own benefit’s.when compared with that of 7 it does not have that much variations.Only few were changes were made.According to me 6s is the best than 7 and 5s.The camera resolution is also good.The iphone itself is attractive and coming to the 6s it is more attractive.