Sodium Batteries now exist and are available in the market and BYD already has cars based on them. The energy density is quite a bit lower so the cars are more like 250KM range but they can be charged very quickly (3C) and the available cycles are more like LIPO around 6000. They are also considerably cheaper, about 1/4 of that of Li ion.
I suspect Sodium batteries will be big in the home and grid storage battery market once we have inverters that support the high Voltage range they operate in. I don't think we will see them much in phones and laptops with half the capacity in the same weight and size but where that doesn't matter they are a much cheaper solution.
Chemically it appears that sodium batteries should be better. However the devil is in the details and so far the details of sodium batteries have not been worked out. Maybe we will in the future, maybe we won't - I cannot guess. Today sodium batteries are not ready.