EVA-8 or Mastiff......

@SinShadow9totally depends on your play style. In close combat both of them are good, especially if you have a double tap trigger on EVA8. but for medium range I found EVA8 deals more damage than Mastiff, I landed 45 damage with EVA8 in medium range, but it never exceeded 13 in the same range with Mastiff (again, it could be my playing style).

+The main advantage of Mastiff is that you can shoot while reloading.
+The main advantage of EVA8 is circle shape pellets spreading pattern.

+If you rush more, take Mastiff.

+If you keep your safe distance and heal with cell and syringes constantly, take EVA8 with double tap on it (double tape let you cover and area in the shape of "8" in the mid range, instead of just a single circle)