If there was a game built around the concept of custom-built player vehicles of any

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If there was a game built around the concept of custom-built player vehicles of any size and with any amount of players onboard, what environment would be best?
I've found two important parameters which massively affect gameplay and aesthetic, and I can't seem to decide on what's best.

Parameter 1: Accessible floor or not?
>benefit of environments where anything that goes down is virtually unreachable:
Players won't shoot absolutely everything in sight like a tryhard, because there's no reward for it.

>benefit of environments where there is actually solid terrain:
Allows the environment to have interesting detail to it, and things which go down will be battled over, adding a natural FPS-like aspect to the game.

Parameter 2: Density of the medium?
>benefit of environments with dense mediums (water):
Realistically-proportioned submarines look less ugly than realistically-proportioned airships; the game can stay realistic without requiring a huge balloon on everything that floats.

>benefit of environments with thin mediums (air):
More diversity in types of movement, since there is a reason to choose between flying, floating, and walking/driving; floating needs a huge balloon and can't go fast, flying uses lots of energy but is fast, and walking/driving is efficient and slim. In water, everything would just use stay as light as the water and propellers.