I’m thinking of Neroli because I heard it diffuses better.
Is that the recommended choice?
Thanks
Hm why are you asking?
Choose what you like. And yes, Neroli is one of the best diffusing fragrances available and smells really nice 
it doesn’t diffuse better,its light so you can cover it with your fav cologne.non fragrance products doesn’t diffuse well,because mones need a carrier(fragrance)to deliver a heavy punch hope that help
Stick to Neroli at 6% when you are starting out, or Akuto at the same strength, which is the next least awkward to use.
Anything else is a far more distinctive scent and will severely limit the number of sprays/size of dose you can use from any given concentration. It only serves to make life harder.
Once you have your effective dose range, then its fine to try other scents as you know how many sprays and what scent combos you are working with.
I have grapefruit fragrance and it is not as good. The sillage is not very good and works only if you are very close to somebody.
I think Neroli or Akuto would be much better than grapefruit.
Hope that helps
Thanks for the answers!
to reply to Mysterion: I’m a little new to the whole thing and I honestly would have no idea how Neroli (or any of the other fragrance choices) would smell. so wanted some good ol’ advice from the people who knows 
Nerolli is a light orange blossom scent - A common component of many colognes itself that settles to a very light level after 30 mins or so.
Akuto is a light musky scent that again combines nicely with a lot of others but not all.
Also worth remembering is that the individual phero content/mix will shape the final scent slightly, which is why all the Instants have a slightly different scent, despite all being in 6% Neroli.
Got a question to add:
does Neroli regular cologne support diffusion just as well as Light (6%)? I know it would be stupid to buy P83 2.5 mcg in 20% Neroli where I have to spray 20 times. But if I know I will be only spraying it once or twice - is it recommended?
I really do love this smell and would like it as regular cologne.
Yes, for a couple of sprays 20% Neroli will be fine - If you don’t mind smelling that orangey! 
You could also get custom PA in that scent and strength and just use it as a cologne.
One thing though, even at 20%, Neroli won’t cover certain mixes - eg A few people have had Ammo customed into this and found it still needs the help of a cover scent.