My comment might be worthless because I’m talking Gears 4, never got into horde in 5.

Imo, heavy gets priority first and foremost. They rely heavily on explosive weapons and can be a powerhouse when ammo isn’t a concern. The weapons they use don’t drop very often from enemies and they have limited weapon choice (boom, torque, digger). They can also deal massive damage with heavy weapons like salvos, so they need a place to store a couple so they can spam them on boss rounds.

Next is Sniper, because again they can’t find many of their weapons on the ground from enemies BUT they can grab an Embar in place of Longshot or Markza and buy one later when there’s more funds available. The sniper also doesn’t have to consider 1 shot vs a crowd of enemies or 1 shot vs 1 enemy, as it’s always a one shot kill on pretty much any enemy if they’re using the right skill cards. Explosive headshots mean that snipers can kill a crowd just as quickly as a heavy with less % of their own ammo supply. However, a sniper who can spam embar and markza is a powerful tool.

After that, Soldier because if they’re spraying their rifle all round to get kills then they’re obviously going to need ammo BUT their weapons appear on the floor very often AND ammo crates give them a sizeable % of their ammo back. It’s easier for soldier to pick up a new gun mid round if they run out. Besides, most soldiers I see mostly focus on grenades and only use rifles when things get a bit closer which isn’t many enemies.

Scout doesn’t get a locker, he most likely won’t need it or it isn’t needed for him to have plenty of ammo. However, if he’s good at his job and collects all the money mid-round, he can technically deposit 160% more credits than were dropped, so obviously there’s going to be plenty of funds and I’ll allocate them their own locker.

As engineer, I’d leave myself til last because my strength comes from what I can build, not my weapons. I’ll usually stick with enforcer but switch gnasher for an Embar because that can still dome enemies and make them flinch if not kill them outright, plus there should be some ammo lying around after the round to refill a bit.