Motherboards have different features that set them apart. Some are just better quality like the "TUF" series such as Gryphon/Sabertooth. Some have wi-fi. Some are better overclockers.
You don't specify WHY you want to change the board either so you might not even get any noticeable benefit.
Z97 supports the upcoming Devil's Canyon Haswell refresh but if you have a good Haswell already that's a waste IMO to get a new CPU and motherboard.
*So I didn't answer the question. My advice is read some online reviews, look at the Asus site and read about the specific features then decide if any justify the cost difference.
I just bought the Asus Z87 Gryphon. Why? It was $155 (armor separate), really well made, has a 5-Year Warranty and has every feature I need.
Other:
I also read an article recently that concluded there was almost NO difference for online gaming between any of the network chips in motherboards. The recent audio chips also seem roughly the same (they're all REALTEK) and there was some debate as to whether EMF shielding did much of anything.
Asus "networking optimization software" sounds great but in reality I've heard a few issues of incorrect throttling. It also only manages the programs on your own computer so if I was playing an online game I definitely wouldn't have a browser or Netflix running anyway, nor would I let uTorrent download all the fully legal content I use at the same time.