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Nanitic escape is more likely to get used more often, Vehicular array is better at high level in the right situation. My guess on why the level difference is everyone I know owns a car they can drive their friends around in, shop, and drive to work in. On one I know has leveled up enough to have a one-person mini-sub or single-seat airplane, even if they did they would likely just use them on weekends. The level difference could also reflect that it's harder to design a sub or something that flies.
If you like the idea of using nanites to make vehicles having both knacks would give you more options. I strongly believe the number of options available in Starfinder is intentionally put there to drive shirren nuts trying to make choices.