This question is like asking which sinking ship you want to goto. Both airlines have nothing but 50 seaters. You are honestly probably better off going to MESA as much as it pains me to say it. XJT/Skyw Inc has absolutely nothing to worry about when it comes to the pilot shortage. There are plenty of 50 seaters to retire if no one shows for class. On the other hand if you enjoy flying to victorville then XJT is perfect for you.