Power = Current X Voltage
The misconception is that speakers such as Apogee needs a lot of power, what it needs is high current type of power. AMG is designed to output a lot of current, so it has no problem driving Apogee. That means, at the same power, AMG has more current whereas ST-10 has more voltage.
Some people choose to buy amp with ridiculous power (that includes Nuprime MCX series) but keep in mind that amps that are designed for such high power > 300W give up some refinement and details. Higher power = higher noise in entire circuit and parts. That's why most Nuprime amps don't go over kill with power.
Hi ! I am considering MCX-2 for my new Focal Aria 948 because they are known to be current hungry (up to 350w recommended: 2 x 21cm[8,27inches] woofers) and I like to listen to concerts, rock, ...
As I am not searching for very warm power amp, I heared that it would sound best for my needs (very dynamic, solid bass, ...).
I know I could loose a bit detail (as you said MCX are not as audiophile as ST-10, AMG STA or Evo One) but that seems to be the best compromise !
Does that make sense ?
Sorry I can't find somewhere near me to listen to a setup close enough from my config !