If I could go nonstop I would. But my only nonstop option is an hour away out of Dulles, and it's United. I refuse to fly them.
My only flights with Hawaiian were awful (and that was first class; from Seoul to Honolulu and then Honolulu to Las Vegas. AWFUL but it was horrible seats and flight attendants). I understand now they offer lie flat seats. I'd take them in a heartbeat.
No way would I do anything other than nonstop if you can. I fly a lot, and have done 3 1/2 hours to Dallas followed by 14 hours from there to Seoul. Lie flat seats on the long flight (along with Melatonin and a few glasses of wine; I slept like 6-7 hours at least).
I'm over 50 now so will not fly coach to Hawaii. $500 each way from east coast is a deal. You want extra legroom.
Look into your return flight. I cannot sleep in an airline seat overnight. I could get by when I was younger, but not now, I need a bed. If Hawaiian offers lie flat, consider it! Worth it!