The benefits of the Fennec having the same hitbox as the Octane is that it is a good all-rounded vehicle. This is because the hitbox size is not too small and not too big and therefore, it provides a more consistent hit than what the other 5 hitboxes in the game offer.

Another benefit of this hitbox design is that players can dribble the ball easier at the front and sides of the Fennec. This is particularly important as you always want to be dribbling with the ball towards the front of your car as you advance forwards. Note that this hitbox only makes dribbling with the ball on top of your Fennec easier. So yes, you still have to practice it to get better!

The Fennec is not a perfect car but probably the best you can possibly get at this moment in time. Other vehicles beat the Fennec in certain situations. For example, cars under the Merc hitbox are more likely to win a 50/50 challenge against a Fennec. However, a player using the Fennec is more likely to beat a Merc player to the ball due to its easier handling. Another example are players using a vehicle with a Dominus hitbox are more likely to get to the ball sooner than a Fennec user due to its longer reach. But the Dominus player is likely to lose more 50/50 challenges. These are just a couple of examples. The advantages are very minor but can make that extra few percentage difference in your games.