So in a qualitative sense, bandwidth is known to be related to the amount of information that may be squeezed through a transmission channel. However, it is not widely understood in a quantitative sense. Many people wouldn't. But with the rise in importance of information technology in people's everyday lives, this question becomes more relevant. The differences between them will basically amount to bandwidth and cost, so understanding of the concept of bandwidth will make the decision much simpler.
Information is transmitted over digital lines in the form of binary digits, or bits.
A single word represents the value of a signal at a certain instant in time. To transmit a voice signal on a telephone line, many samples are taken of it every second, each sample being converted to binary words and transmitted over the phone lines as a stream of bits. The North American phone system samples the analog voice signal coming from your telephone 8000 times per second, or 8 kHz. Each sample is encoded into binary with 8 bits, meaning that 64,000 bits must be transmitted each second. Requirements for bandwidth are increasing all the time.