From 3G &&4G,which is better for us?

• Generally this isn't a choice you will need to make. All of the major telco suppliers in Australia offer 4G services, as do many of the smaller players, and you will use these networks automatically if you own a compatible phone.
• 4G is faster and therefore the better of the two technologies. And, not just a little faster; our testing has seen real-world examples of where 4G can be up to 10 times faster than 3G, or even more. In high-reception areas 4G real-world speeds can well exceed 2x the maximum potential speed of the fixed-line ADSL2+ connection you have at home.
• There is absolutely no down-side to using 4G instead of 3G, other than that it uses a little bit more of your phone's battery.