I drive my tank depends on the terrain and what I'm after.
On flat plane, sometimes I'll go flat out, crush vegetation and ford the water on the way.
Whenever my tank encounters wet mud it'll go straight in the do a dozens of neutral turns in order to get the mud onto the tracks.
In dense wood of course accuracy and slow speed are the best way to go, it's always a test of driving skill to navigate through the wooded areas and to avoid potential traps.