The Mpx out dps's every single other smg for body spray, making it the strongest for shooting the center mass. This is because of it's 1.2 hand and leg multipliers. It has a 'kick' with each burst making not as good for headshots, and it is fairly inaccurate while ads-ing. Average Range and Damage drop.

While the Gilboa has weaker body multipliers but a higher head multiplier. It has very little recoil and extremely high rof making it scary in close quarters. However it has less range than the mpx, and it's suppressor doesn't decrease damage drop by the same amount that the smg suppressor does, making it worse at medium to long ranges.

Note-

Even though the mpx has a worse head multiplier, it does more damage than the Gilboa with a single shot.

Mpx- 4.1 x 85 = 348 Gilboa- 4.4 x 75 = 330

Arms Mpx- 1.2 x 85 = 102 Gilboa- 0.9 x 75 = 67

And it's only weakened by hand protection, and reduce bullet damage, making the clear winner the Mpx.