I do both, but prefer the roll on bottles. I do roll on bottles with monoi and fco 2/3 fco:1/3 monoi. It's awesome as both are moiturizing oils too. Not only does it work as a perfume, but also works great on dry areas. You can do it with any fo also. As for ratios, I use it only as a guideline. If it isn't strong enough you can always tweek and add more fo. JMO