Juyo was not a perfect form and had many weaknesses and shortcomings, many areas which it did not cover, which is why Windu came along and fixed it.Vader may have devised his form to address his shortcomings, but ultimately what he created was far superior to his original Djem So style, and more importantly far broader and more versatile than Maul's style. For example Vader has all the power and aggression of Djem So, combined with the refined and elegant precision of Makashi.
I never said it was, and if Maul used Juyo alone he probably would have some weaknesses and shortcomings. Luckily he has other fighting styles to draw from. Anyway, aside from a lack of focus on defence (which Maul compensates for with his agility and Niman), and a vulnerability to Force attacks, what are these "many" weaknesses and shortcomings you're referencing?
I have to disagree with the notion that Vader's fighting style overall is "far broader and more versatile". Maul's shtick is essentially being highly erratic and unpredictable, as well as being a tactical genius who uses his environment and has strategies to throw away and replace on a whim.
For being erratic, he attacks Komari Vosa in such a way that his blows appear to be coming from everywhere at once, an erratic staccato:
In his mind, the duel was all but over— his opponent was now dragging out the inevitable moment of defeat in a series of small humiliations. By turning to such diversionary tactics, Vosa had all but admitted that she was no match for the erratic staccato blows that he was delivering, seemingly from everywhere, all at once.
-Maul: Lockdown
For using his environment to his advantage, there's Maul casually controlling where the duel at Theed took place, which resulted in Kenobi and Jinn being separated and Maul having Qui-Gon in an area ill-suited to practice Ataru (can't remember the source for the part about Ataru, though):
Maul spun his lightsaber, deflecting his opponents' strikes as he backed through the open doorway. He launched a high kick that connected with Obi-Wan's jaw. As Obi-Wan fell back and rolled across the floor, Maul backed up, luring Qui-Gon toward the power generator. Obi-Wan got up fast and sprinted to rejoin the fight.That's it. Come to me.
Qui-Gon swung. Maul parried and swung back fast, clipping Qui-Gon's blade and then Obi-Wan's. The double-bladed lightsaber was a blur. Maul backed onto an inspection platform that was suspended high over the generator's deep shaft, and kicked off, backflipping to one of the many catwalks that spanned different levels in the shaft. Both Jedi leaped after him, and the fight proceeded along the catwalk.
Maul leered again at Qui-Gon. You think you're driving me back. You have no idea that I'm in control. You don't know where I'm taking you.
Maul sensed the laser doors opening behind him. Qui-Gon was unrelenting in his ongoing attack, but Maul parried every blow. Qui-Gon swung at Maul's legs, but the blade swept under his feet as Maul jumped backward. Maul continued moving back, leading Qui-Gon into the hallway. They passed the first four security barriers before the doors activated and shut.
Warding off Qui-Gon's attack with each backward step, Maul maneuvered around the circular mouth of the generator's core, a virtually fathomless pit.
-Episode I Journal: Darth Maul
For another example of this, Maul maneuvered Anoon Bondara into a position which would leave him without an avenue of escape:
Darth Maul had seen the grim realization in the eyes of his foe: the knowledge that the Twi’lek could not defeat his adversary. Once defeat was conceded in the mind, its reality was inevitable. It was only a matter of time.He pressed his attack to an even higher intensity, driving the Jedi back toward his speeder bike, intending to pin him between the dual-bladed lightsaber and the bike. With his movements thus constricted, it would be mere moments before the Twi’lek’s tentacled head was separated from his neck.
-Darth Maul: Shadow Hunter
And for being able to throw strategies away on the fly, he did this in his first duel with Qui-Gon Jinn:
The Jedi meets my first blow, blocking it. He has expected my flying maneuver.If an opponent can read you, the fight is over. I don't like that the Jedi was perfectly prepared for my first blow. Within seconds, I throw away my usual combinations and strategies.
-Episode I Journal: Darth Maul
For further consolidation that Vader's fighting style isn't any more versatile than Maul's, let's talk about the fact that Maul has not only mastered numerous martial arts aside from Teras Kasi, but the fact Maul incorporates Teras Kasi into both his unarmed counter-attacks
and his lightsaber sequences. Him and Anoon Bondara both somehow incorporated the unarmed martial art into their blade combat.
And while Vader has mastered Djem So to it's Nth degree, and has subsequently drawn from every other Form, Maul's mastery of Niman also allows Maul to dabble in every other Form, which combined with his use of martial arts, dual-wielding, Saberstaff mastery, and of course, Juyo, makes him quite the versatile individual. He has picked up and mastered a large variety of combat techniques, which combined with his tactical mind, makes him at least Vader's equal in terms of versatility.
/rantover
Part 2 to this post coming soon, don't want to exceed the character limit.
