No difference between Standard (FF21) and WE (FF22) Ammo - just scent. FF21 is a strong, clean scent, whilst FF22 is a more euro-style floral scent. Both are perfectly viable but FF21 has a slight edge on overall diffusion.
Summer Ammo has two extra pheros - TAA and P130 in the mix, which gives it a more laid-back/pleasant feel and IMO the best scent of the lot - FF23.
Again, no difference between the A314 spray versons, just that /b is dosed to be closer in impact to oil spray/for drop, so its a good try-out, although it isn’t so subtle and won’t last as long on the skin.