Your choice really depends on what you're planning to do during your 1st visit.
I own DVC and HGVC. I love both locations for different reasons. Keep in mind, both are high demand resorts within their timeshare systems. As an owner, you'll want to book as soon as the booking window opens with DVC and HGVC.
Hilton Hawaiian Village (HHV) is a great resort for Honolulu sightseeing, shopping and dining options. Since DVC points are more expensive (compared to HGVC) and it cost a lot of points to stay at Aulani (compared to Orlando), I only use my DVC points at Aulani when I plan to spend most of my time hanging out at the resort and taking advantage of the resort amenities and beach.
If you're planning to stay on Oahu for more than a week, I suggest splitting your time between the two resorts. Since it's your first time to Hawaii, I'm assuming you'll want to spend some time sightseeing therefore I suggest doing that while you're at Hilton Hawaiian Village and spending a couple of days at Disney's Aulani.
TIP #1: In general, avoid coming to Oahu during major holidays and peak summer. The resorts will be crowded (no chairs by the pools).
TIP #2: Avoid staying at Aulani over the weekends and anytime the schools in Hawaii are out. Aulani will be crowded here. Locals gets a discount.
TIP #3: If you're restricted by a school calendar, I suggest visiting in late August since the majority of kids are back in school and airfare from the East coast is typically lower starting in mid August before NY/NJ kids head back to school in Sept. Avoid going to Aulani over Labor Day Weekend. I made that mistake
NOTE: With Aulani, a car is required but there is no parking fee for DVC stays. With HHV a car is not required (walking, bus transportation and taxis) however if you decide to get a car there is a $29/day parking fee.
Aulani is located in Ko Olina, a 642-acre master-planned vacation and residential community on the leeward coast of Oahu, 17 miles northwest of Honolulu. Other resorts in the area - Marriott's Ko Olina Beach Club timeshare and Four Seasons Resort Oahu at Ko Olina (which replaced the JW Marriott Ihilani Resort and Spa next door).
Aulani Information
Pictures from our Disney Aulani resort stay in Hawaii (2012) -
http://www.tugbbs.com/forums/showthread.php?t=167462
There are least 15 restaurants within walking distance -
http://www.yesterland.com/disneykoolina26.html
Here's a link to additional Aulani resort info -
http://www.wdwinfo.com/disney-resorts/aulani-hawaii-resort/
Ko Olina Resort Map -
http://www.koolina.com/Portals/1/Files/ko-olina-directory-map-20150508.pdf
Ko Olina Resort Site -
http://www.koolina.com/
Ko Olina is within Kapolei -
http://www.hawaiilife.com/articles/2012/06/kapolei-overview/
Aulani: What's the One Thing You Wish You Knew? (long thread) -
http://www.disboards.com/threads/aulani-whats-the-one-thing-you-wish-you-knew.3180904/
Going to Aulani -- Let's list places to eat (long thread) -
http://www.disboards.com/threads/going-to-aulani-lets-list-places-to-eat.2858912/
HGVC threads
For those who are not familiar with the Hilton Hawaiian Village (2013) -
http://www.tugbbs.com/forums/showpost.php?p=1563081&postcount=31
Oahu HGVCs - Help me decide which one to stay (2013) -
http://www.tugbbs.com/forums/showthread.php?t=194183
Best HGVC in Hawaii for first timer? (2014) -
http://www.tugbbs.com/forums/showthread.php?t=212842