And like I said earlier, if you compare the two, you would find that Demise is a more developed character simply by what they say.
But that's not true. I was paraphrasing, but that's LITARALLY ALL DEMISE SAYS.
For Lulz Let's Compare What Ganondorf(TP) says vs. what Demise Says:
We'll Start with demise since he only says about 2 paragraphs throughout the entire game:
Video For Reference:
Before Fight (Paraphrase) "You're foolish to challenge me, you're going to die here, I hate the gods, I'm going to kill you, I wonder how long you last, when you die I'll rule the world and kill all your friends. Then I'll take the triforce and rule the WORLD!"
After Fight (Paraphrase) " You're the best fighter I've ever fought. My hate never dies I'll come back! and Incarnation of my hatred, you and Zelda to have our descendants/reincarnations to fight each other in an endless loop forever!"
I don't really have to say it but there's not much personality here, it's all pretty much generic evil villain stuff. In fact, looking at it now, even what little of his personality we see here is a Fusion of Ganondorf And Akuma, as the only things he seems to care about is ruling the word and having a good fight.
There's not much to say about his actions in this scene since he just stands then talking and pacing (Maybe he's pacing because he's eager to fight? IDK, maybe him looking like Akuma makes me see more akuma in him then there is)
Ganondorf Has a lot more screen time which I guess you could say is a lot of wasted potential since he's Pretty much the same as demise in TP:
Video for Reference. (Video zooms past the dialogue pretty quick but it was the best video I could find ATM)
Before Fight(Paraphrasing, again): "The Twili amused me in how they defied the gods only to fail. Though Pathetic they were useful ad helped my revival. I used their Hatred to revive Myself, though your (Midna's) People had some skill they were not very powerful, not like the people with the triforce. Someone with the Triforce would be a suitable king for this world (midna says she won't obey him) He says that's funny and tells here to try and stop him. He calls link and midna "faithless fools" (impling he considers himself a god) who would dare challenge him, feel my wrath"
Before the fourth and Final Phase of His fight (Paraphrasing, again): Starts laughing after falling of his horse. "Says the master sword looks impressive, but that's all it is, Says that he would like to Use his sword (The one that was stabbed through him by the (water sage?)) to "Blot out light forever"
After he's Beat: (Paraphrased): This doesn't end here! The history of light and shadow will be Written in Blood!"
Ganondorf in TP is pretty much Identical in personality to Demise, the only thing I'd Say demise has over him is Demises respect for link's battle prowess when he loses. HOWEVER, Ganondorf's Actions in TP Speak far louder then his words, His smugness during the Prefight shows how conceited he is, and how he thinks it's his right to rule Hyrule, however, much of this can be said about Demise. No, the biggest thing about Ganondorf In TP is how he uses the sword the Water sage Stabbed him with as his weapon. I think this was to show everyone, (But specifically the gods and Sages) How they were powerless to stop him.
However I guess by words alone Demise is Better, if only because he has the whole "warrior Respect" thing going for him.