Nic salt and freebase are different shopping lanes
Nic salt is commonly chosen for compact, lower-power pod systems and higher nicotine strengths. Freebase e-liquid is commonly chosen for refillable devices built for more vapour and lower nicotine strengths. The product page and device manual matter more than habit or guesswork.
Usually paired with pod systems, smaller devices, and higher strength options shown on the listing.
Usually paired with refillable tanks, larger vapour devices, and lower strength options shown on the listing.
Use Contact before checkout if the device name or bottle style is unclear.