harry potter - Would it be possible to create a wand more powerful than the Elder Wand?

According to Dumbledore, the Elder Wand was not created by Death himself but rather by Antioch Peverell. So, is it not possible for a powerful wizard, such as Dumbledore, to create a wand that equals or surpasses the Elder wand? Is it even possible for another wizard to be as knowledgeable in wandlore as Antioch?

Answer

Your questions are, if I'm reading correctly: Is there any wizard [in history] who is as knowledgeable in wandlore as Antioch Peverell, and you also want to know whether a powerful wizard, such as Dumbledore, could create a wand that equals or surpasses the Elder wand?

Yes. Garrick Ollivander, according to Pottermore (emphasis added):

Mr Ollivander is arguably the finest maker of wands in the world, and many foreigners travel to London to purchase one of his wands in preference to those on offer in their native lands. Mr Ollivander grew up in the family business, in which he showed precocious talent. He had the ambition of improving upon the cores and wand woods hitherto used and from his earliest days conceived a single-minded, even fanatical, determination in his pursuit of the ideal wand.

and also from Pottermore:

While there was initially substantial resistance to this revolutionary way of crafting wands, it swiftly became clear that Ollivander wands were infinitely superior to anything that had come before. His methods of locating wand woods and core substances marrying them together and matching them to ideal owners are all jealously guarded secrets that were coveted by rival wandmakers.

"Anything that comes before" would include the Elder Wand. It has not been excluded. There is no caveat from J.K. Rowling stating, "Ollivander wands were infinitely superiour to anything that had come before ... EXCEPT FOR THE ELDER WAND!"

So, yes, a very prodigious wizard or witch wandmaker could -- and has, in the case of Mr. Ollivander -- crafted a finer wand than the Elder Wand. Ollivander knows more about wand-making than Antioch Peverell.

Taking the last word, Dumbledore sets the record straight on the Elder Wand and its supposed superiority:

What must strike any intelligent witch or wizard on studying the so-called history of the Elder Wand is that every man who claims to have owned it has insisted that it is “unbeatable”, when the known facts of its passage through many owners’ hands demonstrate that not only has it been beaten hundreds of times, but that it also attracts trouble as Grumble the Grubby Goat attracted flies.

Ultimately, the quest for the Elder Wand merely supports an observation I have had occasion to make many times over the course of my long life: that humans have a knack of choosing precisely those things that are worst for them.
_{Tales of Beedle the Bard - Page 104 - Bloomsbury - The Tale of the Three Brothers - Albus Dumbledore's notes}