The McIntosh MI128 is an 8-channel amp. The 4-CHerry is a 4-channel amp, of course.
This is for a 2-channel system that requires 4 channels of amplification per channel, so one advantage of the 4-CHerry is that the speaker wires can be kept short by bringing the amps closer to the speakers.
A system upgrade was proposed by replacing their MI128 with a pair of 4-CHerry Amps, so here's a comparison, based on specifications....
MI128: Single ended only (RCA)
4-CHerry: True Balanced (RCA adapters included)
MI128: Phoenix connectors
4-CHerry: Gold 5-way Binding Posts (WBT on KING version)
Power Output into 4Ω
Power Output into 8Ω
THD+N, 10W into 8Ω
Damping Factor into 8Ω
MI128: 0Hz to 20kHz
4-CHerry: 0Hz to 100kHz
MI128: 18 x 19 x 5 inches (approx 1700 cubic inches)
4-CHerry: 14 x 8 x 5 inches (approx 600 cubic inches)
MI128: 22 lbs (10 kg)
4-CHerry: 12 lbs (5.5 kg)