Btw this is just an opinion
Ducky is better at most situations ex: late round, falling down where you were, saving money by not using jetpack (and even more)
Plane is pure luck bc you might get tripped before flying or explode by a simple fart, but it could be useful in some situations ex: bossfight (instead of evading everything with ducky just fly and not die), escape skullguard or a horde (depends in luck) or explode a horde and earn 5$.
In my opinion ducky is better on some maps where you need a high mobility or quests, and plane is better, for bosses or maps where you have a open space to fly out
Also tripod is the worst mount