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My take is that there’s plenty of room for both in the market.
Lightyear One has a more conventional layout and shape, five seats instead of two, about as much cargo space with the rear seat up and ~2.4x the cargo space with the rear seat down, and is narrower (extremely important for some markets, unimportant for others).
Aptera has higher efficiency and therefore longer range on the same battery or the same range on a smaller battery, a larger battery option (Lightyear One is 60 kWh only, Aptera has a 100 kWh option), lower cost, but with the downside of only 2 seats, more controversial styling, and the “if you don’t hit it with the outer wheel, you hit it with the inner wheel” problem with hitting bumps inherent to a three-wheeler.