What advantage does ATX have over Micro ATX?

Size - that's about it. Good for installing in smaller build PC's, but no less powerfull than full size boards. Drawback is you will have less slots available for expansion of additional...

There are not really any advantages with a ATX over a Micro ATX just Micro ATX is smaller and ATX is larger

You can generally fit more stuff onto it, pci. microatx boards aren't generally compatible with standard size cases.

adding and removing components easier,providing greater support for I/O devices and processor technology,lowering costs.

Size is the advantage.MicroATX is usually much smaller than normal ATX and usually has fewer expansion slots like PCI (+variants), fewer DIMM sockets (usually 1 maybe 2) they are often built around...