As said, the AMB ones are the official ones to match the timing system, they are made by the same people as make the timing system. All come with totally unique ID numbers, so you never clash numbers anywhere.
MRT are "compatible" ones, made by someone else. As standard they all come with the same 20 numbers on them, so you can choose which number to use if you get a clash with someone else using a standard MRT one in your heat.
MRT will also take your AMB PT, if you have one, and clone the number onto one of their PT's for you, so you can have 2 PT's with the same ID number on. This means that you don't need to use one of their 20 default numbers and it helps keep booking in and managing your PT's simple if you have more than 1 car/race 2 classes.
Not owned one of the MRT's myself, but heard nothing but good things about them.
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