Monitor Audio Platinum or Magico A3

Oh, one other point. Magico uses caps which add quite a bit of color, if not scintillation to the top end to some speakers. It's like old Fuji film. 

I make no value judgement, but want you to note this may be happening, so take your time while listening and buy what you want to live with. :) 

OP:

The issue comes down to a couple of areas: bass reinforcement as well as mid/treble dispersion. 

Magico's have super-wide dispersion. In a well treated room, or one with lots of space to the sides, this gives an excellent image and tonal balance in a wide sweet spot. 

Monitor Audio tends to be a little more "apartment" friendly. They control dispersion, and have less inherent bass so when you put them in an average room they will sound better. 

Both are significant technical accomplishments, and to reiterate, you must listen, but keep in mind the audition space, and compare to your own target space. :) 

Magico tends to make their speakers for rooms where there is lots of space to the sides and behind. 

Monitor Audio for smaller rooms with more restricted listening locations. 

This is by no means the deciding factor. You should listen for yourself, but if you listened in the store and thought both were equal, I'd consider the room. 

Best,

E