Which chassis should I pick for which terrain?

Pick wheels for speed on open ground, tracks for a steady all-rounder, legs to cross boulder fields and steep slopes, and a flier to get over boulders and shoot down past blocks' edges. Boulder fields stop tracks and wheels completely. Legs cross them at half speed, and fliers get over them from 3 m up. The Factory's Chassis shelf has a tab for each kind (Flying, Tracked, Wheeled, Legs), and each chassis's hover panel gives its numbers.