LTE bandwidth is extremely large. Compared to 3G, LTE is way much faster. Load a youtube video, perhaps 15mins video, LTE can finish downloading it in less than 10secs. 3G got to buffer slowly.
LTE download speed at any one point of time if the place is not crowded it should give you 9mbps to 24mbps. Anything more is a bonus.
But if you are using it at crowded areas like shopping malls, then it could be slower.
Too bad im working in telco company. If i can tell you why you should upgrade to LTE i would kindly elaborate more about LTE and 3G differences.
But in terms of customer point of views. LTE is way much faster.
Another thing to take note. Since recontracting an iphone 5, you must take note that iphone 5 has only one band of frequency use in LTE, 1800mhz.
Do not come back to telco and complain why you got no coverage for LTE if you stay places near the sea. Places like Tuas, Marsling, Sembawang, Punggol, East Coast Park, PSA Port, or any other places near sea. Simply because these area are using 2600mhz frequency. This is to control the cell coverage size so that it wont go too far out at sea. iPhone 5 will work properly on SH network as they are only using 1800mhz refarm for LTE. They don't operate LTE on 2600mhz. So it might work properly. The only thing they are lacking is their LTE coverage is nuts.