There are not really any advantages with a ATX over a Micro ATX
just Micro ATX is smaller and ATX is larger
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ATX
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flex ATX above that is the micro ATX
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I have often wondered what ATX in ATX software stood for. I
always just ignored it but upon further inspection I have
discovered that the ATX stands for Advanced Technology
Extended.
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There are no similar form factors to ATX if you're talking about
a slimline. Slimline form factors are NLX and LPX. The form factors
to ATX are BTX, Micro-ATX, and Flex-ATX. There is no correlation
between slimline and ATX.