No difference, just dose. /b is a reasonable approximation to the oil in impact whilst /a is a bit stronger.
Oil is still the gold standard though, far better in most ways, each application lasts far longer on your skin and considerably more economic in the long run. A bottle of oil contains around 270 drops, which will last you several months compared to the togos at 40 sprays each.
At your age, I’d suggest the /b version as too much A314 can be highly incongruent on a younger guy.
Its also worth remembering that the heavy status pheros/mixes can be a bit hit or miss around girls your age as they can give an “older than your years”, too serious, not approachable, not cuddly or “daddy”-like vibe. Something much lighter like IG might be a more viable option. But if you are going to try A314, start from the lowest dose.
Oh and if it does work out for you, get the oil next as it really is a life-changer!
So does the /b version last as long as the oil ? And do you think it a good idea for a 20 year old to be using this stuff ? I know the OP wasn’t recommended to use it because he is 19 but I thought that the age difference between 19 and 20 was one of those significant one year age differences or something .
No - nowhere near as long. The sprays last around six hours per application whereas oil lasts 8-10 hours.
and that can be further extended by applying over lotion.
The similarity is in impact The slightly weaker /b spray is closer to slower diffusing oil in the way it hits/doses. A spray of/b can be used to approximate a drop of oil. Still nowhere near as subtle though.
Difficult - It all depends on your congruence and personality projection - I reckon a more mature 20yr old could use a small amount more productively.