naGHB (Sodium GHB; Na+GHB-) is one of the forms salt forms GHB comes in. It can either be as a chunky/ waxy white/yellow-offwhite crystalline powder that absorbs water freely from the air so must be kept in a sealed container except for when measuring out doses or it fucks the dosing up, or volumetrically dissolved in an amount of water for easier storage/consumption. One can get bacteriostatic saline water for this. kGHB (Potassium GHB) is the other form GHB, whether it is one or the other depends on what reagent (NaOH/KOH, informally known as lye/caustic potash) is used to make it from (usually from GBL).
How do they compare? naGHB/kGHB simply taste salty, and kick in slower with an overall more chilled-out effect. It can get pretty intense at high doses, but seems way better for the body.
GBL has an effects profile of its own, immediately attempting to dissolve into all your tissues/blood while pulling OH- cations from your bloodstream, tissues, etc. This can result in a condition called acidosis if proper time isnt given between doses, or doses are high enough for a prolonged period. GBL is, ime, way more manic, prone to blowouts, and more addictive with a much worse comedown/worse quality sleep. GBL is good dont get me wrong, it has its own flavor of euphoria, but the blowouts are something special. Seems to have the tolerance increase much higher than GHB as well, with GBL i would blow myself out before a long day of partying/with stuff to do the next day, and get perhaps 3-4 hours to sleep waking up refreshed(yet extremely manic). With GHB, it was more of a smooth sleep, and I could easily get my 4-5 hours and then have relaxing shower, etc in the morning without any extreme mania.
Never (knowingly) tried 1,4-butanediol. From what I have read about it, it has no effects profile of its own until metabolised into GHB, and the metabolic pathway of it means that if one has alcohol in their system, the 1,4-butanediol will keep building up until the alcohol is metabolized (perhaps with an unwitting individual drinking more and more of this "weak g 1,4-butanediol" along with alcohol, only to blow out super hard at the end of the night.
I would recommend if anyone has GBL or 1,4-butanediol (the two main ways vendors list them online), to look up how to convert to a GHB salt before dosing, if you want to get the full benefit out of GHB.