Difference is that all flights and times can be purchased. AA flights or AA flight using Avios need to be released and if you noticed recently they release very few. This really matters for Maui or Kauai flights. Seems to me that best will be to use Chase UR points with Chase Reserve card at 1.5 cents to purchase tickets you want at times you want and earn mileage on the purchased tickets.
Choosing random weekend dates in March, the least expensive nonstop to Maui is currently $759 from LA (and that's not even direct with the airline, so likely more with Chase). Assuming I earn one point per dollar spent on this card, which appears to be most applicable to me though there will be exceptions of restaurant and travel at the higher rate, that means I need more than twice the amount in spend (at the 1.5 points travel redemption rate) as compared to Avios, which was my only question (availability is a related, but separate, concern).
$759 is 50,600 points with the 50% bonus redemption via their travel site.
If my spend is strictly those categories that earn three points per dollar, then this would require spending $16,867 for this ticket which would be a great redemption value. However, that's not realistic for many of us though I can see myself using this as the go to restaurant and travel card (though I'm still liking my 2.1% benefits from Barclaycard for travel).
Even if I spend some on travel and restaurant to earn three points per dollar, the bulk of my spend will only earn a single point each.
It's early and my math skills take time to wake up, but am I incorrect?
It seems to me that, availability concerns aside, Avios is still a much better redemption option for LA-HI on AA. The risk of availability and limitation on options with Avios is a question that each of us might assign a different value.
All that said, I'm still leaning toward getting this card if only for the first year for the included 100,000 points since that alone would get $1500 toward travel, which is still worthwhile even after the net annual fee.