I finally finished reading the Harry Potter series

[TWRoO]

Smeags said:

rocketpig said:

I also wondered about how Dumbledore defeated Grindelwald when he had the Elder Wand. But given the rest of the book's theme about how the pursuit for power and objects is nothing more than folly, I'll give Rowling the benefit of the doubt and just say the point is that nothing is "all powerful", even the Elder Wand. It's just a really, really good wand.

Indeed, as Voldemort and Dumbledore dueled to a virtual standstill in Order of the Phoenix despite Dumbledore's mastery of the Elder Wand.

Also, I'll add another fantastic moment in Deathly Hallows: the death and revelation of Severus Snape. An incredibly powerful moment to be sure... and one I think they captured wonderfully on the big screen. Especially with Alexandre Desplat's composition.

Well for the former fight Dumbledore was the superior wizard, the wand is just a wand even if it helped Grindelwald become powerful. Also we don't get any specifics of what happened in that duel.
In the second fight Dumbledore is old. Hell he must be a minimum of 80, while Voldemonrt is in a body he created himself a year before.... also it's a lot easier to destroy than protect, Dumbledore had to protect Harry and himself and try to trap or repel Voldemort, while Voldemort was trying to kill them both.