Both of these bulbs look very similar but they work very differently. MR16 LED bulbs have two small pin connectors. These bulbs also work from a 12v supply which requires a transformer to convert the mains voltage to a Low voltage. That is why these bulbs are sometimes known as "Low Voltage' or 12v bulbs.
A GU10 LED bulb works from a mains voltage and therefore will not a need transformer to convert the voltage. These type of bulbs are the most prevalent and they also allow dimming with the right kind of LED dimmer switch.
Further information can be obtained from
http://www.lightrabbit.co.uk/blog/the-beauty-and-simplicity-of-the-gu10-led-bulb-2/
Anna Michelle
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