A FlyerTalk Posting Legend
Join Date: Sep 2002
Location: LAX/TPE
Programs: United 1K, JAL Sapphire, SPG Lifetime Platinum, National Executive Elite, Hertz PC, Avis PC
Posts: 42,205
Depends - what's more important, miles or comfort/service?
I just flew the Hawaiian 767 from SEA to OGG - very comfortable seats (if legroom is an issue, you can $25 for an exit row), decent inflight entertainment, free beverages (3 passes during the flight), free food with optional paid upgrades and rental video units if you're not happy with the free inflight entertainment.
The aircraft is spotless (a 767-300 with winglets and Boeing's new-style 'wave' interior) and you're flying Hawaiian - you're in the mood before even leaving the ground in CA.
So - all things being equal (cost/flight time) and earning miles aside, I'd take Hawaiian. If you need the UA miles, then that is your only option from SFO.
One thing to consider - Hawaiian flies from SJC as well, and you should check those flights to compare.