BizJet: DTW doesn't have a President's Club. So you get to spend your layover among the masses. Or perhaps on the tarmac...

Re: Southwest option: my first time on them, about 20 years ago, I bought a ticket SNA-El Paso to visit a friend who had recently moved to West Texas. All I knew about Southwest at the time was that they offered the cheapest fare on that route. Imagine my surprise when the plane made stops at PHX, ALB, and Odessa/Midland before finally touching down in El Paso. What an odyssey!

It left a bad taste in my mouth and I didn't fly them again until last Saturday, when an IAH-DAL segment on CO got cancelled and I was issued a voucher and told to go over to the Southwest ticket counter and pick up a one way to get to Love. I found the service comfortable, efficient and pleasant, just fine for a short hop. Infinitely better than option #3!