The few times I fly now, SW is the prime choice. Alaskan (inverted 727s not withstanding) the best I've flown on in the last few decades, but they don't go my way much.
We flew Alaska Air last march to and from Hawaii on a 737. It was a long but mostly comfortable flight.
I think my favorite airplane was the 727 which NW had plenty of. A pilot could stand one of those things practically on its tail to get out of short runway or bad weather situations...