In Emacs ESC can be used as Meta key instead of ALT. One advantage of ESC in this scenario: You don't need to press the keys simultaneous, you press them one after another. This is nice solution when you have a non-English (e.g. German) keyboard layout and you need to press e.g. Meta+[ because on a German keyboard [ is in fact ALT GR+8 which might lead to a knot in your fingers.
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In Emacs ESC can be used as Meta key instead of ALT. One advantage of ESC in this scenario: You don't need to press the keys simultaneous, you press them one after another. This is nice solution when you have a non-English (e.g. German) keyboard layout and you need to press e.g. Meta+[ because on a German keyboard [ is in fact ALT GR+8 which might lead to a knot in your fingers.