Although an amplifier max current rating doesn't represent anything useful, however, if two amplifier both rated 100watt/channel, one max current rated 50A and the other one rated 30A, we can assume that the 50A rated one has a beefier power supply.
Not necessarily, especially if the amps being compared are from
different manufacturers, because (using your example) the amount of time
the 50 amperes and 30 amperes can be supplied for is not usually
specified. For example, the 50 amperes may be suppliable into zero ohms
for only 10 milliseconds, while the 30 amperes may be suppliable into
zero ohms for 25 milliseconds.
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