In most comparisons, biltong has the nutritional advantage, and the difference comes down to what gets added during production.
Traditional biltong contains no added sugar, no artificial preservatives, and no smoke-related compounds. The curing process uses vinegar rather than sweeteners, so the carbohydrate content stays near zero. A typical 30g serving delivers 15–18g of protein with less than 1g of carbohydrates.
Most commercial beef jerky uses a marinade that includes sugar, honey, or corn syrup as a primary ingredient. A standard 30g serving can contain 5–8g of sugar alongside significantly less protein than biltong of the same weight. Many brands also use artificial flavour enhancers, preservatives, and smoke flavouring.
The honest caveat: not all jerky is the same, and not all biltong is the same. Always check the label. But if you are comparing traditional air-dried biltong made with whole beef cuts against a mass-produced commercial jerky, biltong wins on almost every nutritional metric