D1 is better, versatile and more engaging.. D2 ... will use 1 of the 2 .. will use the other if out of ammo or to take shields down .. A better system need to be implemented or reverted to D1 .. For new system that need to be studied is D1 system with the ability to equip any primary as secondary.. but need to be evaluated so there won't be glitches or stupidly op thing so it won't dominate (no nurf)