Ko Samui vs. Ko Tao

Which is more advisable, Ko Samui or Ko Tao?
Ko Tao or turtle island is quiet ,calm and close to diving area ,but if you prefer hotel facility ,light and sound of the city then Ko Samui is better.
If you look for the same price hotel seem to be that you will get the better room and service than staying in Ko Tao,but the beach and the sea of Ko samui is not beautiful as Ko Tao. So got one loose one.
To sum up
If you want more on hotel facility and convenient then select to stay at Samui ,but if you want to enjoy scuba diving ,coral diving ,nice and quite beaches then Ko Tao is recommend.