Having flown on both airlines on a multitude of times. I have to agree, Southwest is a class act why Ryannair is cheap and nasty.
Saying that, I will fly on Ryanair again as I know I will normaly find the cheapest price with them, and I am prepared to accept what I pay for.
Southwest on the other hand do not necessarily have the cheapest fairs anymore.
You get what you pay for.