It's all about pH levels, chemical structure, and the kind of vape experience you're after.
Salt nicotine is easier on the throat, even with high nicotine levels, thanks to a pH tweak. Freebase, on the other hand, can get harsh as the nicotine level climbs. Salt nicotine needs more heat to vaporize and hits differently in the body.
Your choice between the two boils down to personal preference. If you're quitting smoking, salt nicotine might be your go-to. If vaping is more of a hobby, freebase gives you control over nicotine levels. And if you're ever up for exploring vape juices that smell better (even for non-smokers) and come with zero nicotine, check out https://www.driplocker.com .