This is more of an advanced tip if you're doing solo squads or duos. If you have an option between having a Deagle or SMG, pick an SMG since it has more firepower. 

The Deagle is less useful against squads since it's main use is to take down structures, which isn't that useful in squads since there are going to be multiple people building towards you. There's no possible way you can knock a good team down when all 4 are building towards you. 

But if the Deagle is your preferred chose, then have at it! I just think the SMG is better since it can shred people quickly.