Since you are asking in the Dollar forum, you are probably going to get responses that are pro-Dollar of course.
I haven't rented a car at HNL in a long time, but this page says there are only six rental car companies on airport property
. Dollar is in the list but Thrifty is off-site, meaning you will need to take a shuttle bus. I hate shuttle buses so I would go with Dollar.
You might also try Enterprise if you are shopping for competitive quotes. Thrifty, Dollar and Enterprise are all about the same when it comes to prices at HNL. And Enterprise is on-site.