Atomizer (or cartomizer)
resistance works hand in hand with battery
voltage to produce the
power (measured in
watts) of our
vaping experience. There is even a law about it ...
three interrelated laws actually.
Back in 1829, Georg Ohm, who was vying with Voltan Volt for the affection of Alma Amps, observed that
Amps = Volts / Ohms. Then in 1841, Georg's friend, Jimmy Joule (who was obsessed with power), got his girlfriend, Wanda Watts, to arrange a threesome for Georg with Alma and her twin sister, that is,
Watts = Amps X Amps X Ohms. Wanda, however, wasn't into girls. She liked Georg and had a crush on Voltan and his twin brother, so she took up with them, giving birth to:
Watts = Volts X Volts / Ohms
So what do these nineteenth century romantic entanglements mean to us twenty-first century vapers ... and to your specific question?
The
higher the voltage of the battery, the more powerful the vape (e.g., vapor and TH). So a true 3.7V fat batt or mod will hit a bit harder than a 3.2V eGo or 510 battery; and a 5V or 6V (or variable voltage) mod will hit much harder.
Equally true: The
lower the resistance of the atomizer/cartomizer, the more powerful the vape. So a 1.5 ohm "LR" 510 atomizer will hit harder than the standard 2.3 ohm resistance 510 atty.
And we now finally get to your question: There is only a subtle difference between those two options. One is not "better" than the other. The 2.4-2.6 will provide a
slightly more intense vape than the 2.6-2.8 ohm (but you might prefer the higher resistance one). [BTW, the ranges (which I've seen phrased this way most often for CE2 cartomizers and clearomizers) point to the fact that resistance values are
approximate and vary slightly. Some suppliers use 2.5 +/-.1 and 2.7 +/-.1. And many would call these simply 2.5 ohm and 2.7 ohm.]