Let me save you some effort.
In fact if your going for nothing but shield damaging then Large Shield Depleters are the way to go. They take up less space fire at the same rate and eat up the same supplies while doing more damage to shields and taking up less material to build. However they are not capable of damaging the ship itself only the shields. And I have on several occassions found that the difference between defeat and victory was the extra 60 damage that each of those guys pumped out.
Finally using the Temporal fits in with the personality of the race I normally play with.
Here are the actual numbers assuming Large Mount:
Temporal - 240 damage to shields - 60 to ship
Fire Rate - 1
45 kt
Depleter - 300 damage to shields - 0 to ship
Fire Rate - 1
30 kt
No damage reduction for range in either of them. Both have range of 7.