Originally posted by ILSYou misunderstand, I am not saying that Maul's defense is poor, but that Vader's is simply better. In practice this may not appear the case, but neither of them have really being pushed to their limits, in theory however Vader should - with the tools he has at his disposal - come out on top. He just has more defensive resources.
Your posts continue to imply that Maul doesn't have a good defence - why do think this? Maul's defence is less obvious than Vader's but I don't see it as any less formidable. Ataru is a purely offensive lightsaber form well suited for taking on a single opponent in saber combat. Maul, to quote, effortlessly, deflected and avoided the assault of two skilled practitioners of Ataru whilst landing numerous counter-blows and manipulating the location of the fight. The Saberstaff aids Maul in defence as well due to it allowing Maul to cover a wider area in a shorter length of time, but it's hardly his only saving grace when it comes to going on the defensive. Maul easily deflected Savage Opress' blows while on the backfoot (albeit he was early on in his training, but a much angrier version of Savage has given top-tier duelists trouble before so he wasn't exactly useless), and has two forms of battle-precognition at his disposal to boot (foresight and telepathy). His clone/resurrected version was easily managing being on the backfoot against ANH Vader for pages on end whilst landing counter-blows regularly, and while this version of Vader isn't as skilled as prime Vader, he's still a physical powerhouse, and accounting for how easily Maul was defending from him, it's enough to suggest he could hold his own against a prime Vader's offence with more applied effort.Maul's offence is obviously his main form of attack, and his use of Juyo means he will be vulnerable to Force attacks from time to time, but in terms of saber defence he is actually better than most.
However you make some good points, in the end though I think all this proves it that neither has a large enough advantage to make an impact on the duel.