Nightwing is BETTER in terms of agility then Daredevil.
For gods sake, the guy grew up in circus! In family of acrobats! He probably learned to do tricks on trapeze as soon as he learned to walk.
This says it best:
Bar none, Dick is the premier acrobat not only in Bludhaven, or the United States or even the world, but perhaps most of the known cosmos. Naturally gifted with an astounding about of innate agility, Dick has also been trained since before he could crawl to preform acrobatically. His parents were perhaps the worlds best aerial trapeze artists and they wished to instill even more prowess to their child and thus taught him everything they knew. Since before he could walk, Dick has been as ease with being in a freefall well above the surface below, twisting and cortorting himself in the air. This has only been compounded by all of the additional training he's had later in life, primarily under Batman's tutelage. He can preform a near endless string of complex tucks, rolls and flips in rapid succession and has no problem adapting to any environment or situation in which to bounce around in. Dick is accomplished at any acrobatic event known to man and could likely win an Olympics were he to enter them, with relative ease. But he's also very much able to craft his own routines off the cuff in the middle of a firefight.
A great spin-off from his acrobatics is his ability to tumble, to tuck and roll and fall *with* a force directed against him rather than be completely subjected to it. He's been trained to take falls from great heights to avoid injury and especially death, but he can also roll with the punche's, which is what he does most often in combat. Rather than beating on a foe, hell go with the flow, take some blows while looking for a weak spot/moment and try to tire his foe out.
It should be noted that Dick's natural agility, which fantastic, doesn't make him the level of acrobat that he is. It helps, but while he might be able to fold himself in half or the like, its his skill and continued training that maintain his acrobatics. He has a natural affinity for it, but still he practices to keep it up (which nightly patrols swinging around town often does).