Skywest has short and long term disibility. They do have better retirement and medical. They have a ton of 50 seaters which will fade out sometime, perhaps offset if they can find homes for the 250ish firm aircraft they have on order. Compass has explosive movement until the end of the year and few lifers. Lets pat all ourselves on the back and finish the cup of Koolaid. Both are subcontractors for major airlines whose very existence is based on being under compensated.
Pick whichever gives a good QOL, be smart with the little money you earn, have fun on the overnights, be cool to your coworkers, travel a bit, and pursue the next great opportunity when it comes.