The potency of the lemon essential oils mainly has to do with the limonene level. Some of the oils are harvested to make higher levels and have an off-smell so when asking me for the most potent, just know that the actual most potent ones don't smell the most authentic.
(I can send samples of this if you don't know what I mean)
Some oils are stronger while some are 2nd pressed to get even more oil out. These are harder to get and companies try to squeeze more oil out at higher pressure so they won't lose money in wasted oil. This can get that extra oil but saves them a bunch of money. Most people have such bad body ecologies that they don't even know when something smells off. As a raw foodist, its easier to smell when oils smell off. I am not addicted to any toxic smells.
I will test the strength of the oils and compare them to the authenticity of the smells. I will recommend a lemon oil based on your answers on my quiz. If you want a faint smelling oil but super authentic that is not very potent or a really strong oil that doesn't smell 100% like a lemon rind, let me know this on my quiz.