In that case - to explain further - most foes will likely have standard shields... or at least not shields stacked to 50%+ resist, across the board. That means thermal damage is your friend, which generally means lasers.
It really depends on how you're managing your power. If you have distributor to spare, then ditch the efficient for something more zappy. If you are struggling a lot for distributor but not cooking, consider an incendiary MC or two: Very distributor efficient for their DPS. Then balance that with your laser output.
My personal preference is to avoid efficient, unless on small turrets on the largest class of ship*. I'd just rather have something more killy, and then manage the WPN drain by countering with other weapons, such as incendiary MCs, or squeezing in a feedback cascade railgun. And if I start running hot, use thermal vent on the laser. That's preference for big guns and enjoying having a choice of weapons talking.
The ram approach and PAs outlined above are both also viable, fun and effective, although a little more specialised in use and/or build requirements.
*Class 1 efficient pulse turrets also help against shields, as they help prevent sheild regen (assuming there's not railguns in those slots).
