Creating a second hatchery and continuously producing Drones or building a queen and waiting for Inject to finish before creating an explosion of drones.
I suspect that while Inject gives more larvae than a second hatchery, creating drones for the entire time Inject cycle and drone production time lasts leads to significantly more minerals in the bank.
Now you're probably asking "Why would you worry about such an odd thing...Queens are just...better" and while I normally agree there is one build in ZvP which may be the exception and that's 12 pool expand with an extractor trick to get out the 6 lings. In this build you double expand, skip queens until your 4th and rely entirely on constant drone production generating minerals rather than waiting for Inject to finish to get an explosion of drones.
Whenever I play normally I often notice that my expands are much more sluggish and my bank doesn't increase nearly as fast but this is just anecdotal evidence.
Can someone please help me figure out how many minerals you get by using a hatchery for drone production, constantly making drones as larvae appear vs the minerals you get from using Inject for drone production in say, 29+36+12=77 seconds? The 77 seconds is reflective of the Queen build time, the Inject duration and the Drone build time?