400 amps?? That's some healthy current - maybe you mean 40 amps?

Anyway, the amplifier with more output devices will with all other things being equal be able to pass more current than one with fewer output devices. Now the power supply may not be able to supply that current, but that is another issue! There are too many variables in an amplifier's design to make any specific judgements about the current capacity of any particular amplifier.

By the way, 10,000 microfarads is NOT very impressive - for a really stiff power supply, the capacitance shoud be at least three times that amount per supply rail.

Don't get too hung up on amplifier current specs. Manufactures rate their products using different testing methods, and unless you know specifically in what manner that current capacity is needed, there is no way to usefully compare between amps, or your need for "X" amount of current in the first place.