High clock speeds, plenty of ports, and lots of RGB lighting.
The pick of the bunch is that Aorus GeForce GTX 1080 Ti Xtreme Edition, and it's so extreme they've cut off the first E. In Gaming Mode you'll get a base block speed of 1607 MHz and a boost clock speed of 1721 MHz. In OC Mode, you'll get 1632 / 1746 MHz base / boost. All of these numbers are rather healthy overclocks over the Founders Edition card with its 1480 / 1582 MHz base / boost clock speeds. This card's memory speed has also been giving a jolt, up to 11.23 GT/s in Gaming Mode and 11.45 GT/s in OC mode.
Of course all this extra power needs some serious cooling, which the custom 3x 100mm fan solution should handle nicely. It's also got RGB lighting across the big X found on the front of the card, as well as the logos on the top and back. As for ports, the card is designed with VR in mind, with an extra front facing and two rear facing HDMI ports. Plus, you've got three DisplayPort 1.4 ports on the back. It seems like the only thing this card doesn't have is a built in LCD display.