A lot of your results will depend upon the kind of processes you use, one variable being how much heat the scents are exposed to in the process. Storage of the product afterward will make a big difference in how long the fragrance lasts. Not being a soap-maker, I'd have to recommend research and experimentation. Some oils are processed from crops that are harvested all at once, while others are harvested by the blossom. The processes by which the essential oils are distilled from the botanicals vary.
Some crops yield multiple distillations, while others only yield one.
Other crops, like Jasmine, yield oil one blossom at a time. That oil is frequently collected by the 'enflourage' method, which has many steps from harvest to oil reconstitution, making it much more labor intensive. Then there are some oils where the first distillation is the best, but subsequent distillations are also made and sold for a lower price. Still other oils get re-distilled. We carry a Peppermint Oil that is a triple distilled product - and gives you that wonderfully cool breeze fragrance.