hi i like the idea that ssj4 is an outlet for the oozaru instincts that are usually suppressed bc neither of them have tails.
personally i love the concept that since vegeta could control his oozaru form but goku couldnt, ssj4 vegeta is himself just a lil more reckless and in touch with his instincts while ssj4 goku turns into a big hyped up adrenaline fueled monkey puppy











