Sodium ion batteries are better in almost every way, except energy density. They are bigger and heavier to provide the same amount of energy storage. Sodium is available everywhere, cheaper and requires less energy to manufacture, fewer toxic waste components, charges and discharges faster, and lasts longer.
This company is selling 9,000 mah packs for $65-70 depending on the exchange rates, but the prices will come down as more manufacturers join the market.