I'm a cheap bastard. For personal reasons, for close to 2 decades now I've had reason to be in Georgia in February.
Typically I've taken coach down and sleeper back (usually using points). One night I can manage.
The downside of coach: I just can't quite get comfortable. The seat's not quite flat enough and if I lay on my back, my head isn't comfortable. I did find two pillows, one in the small of my back and one for my head really helped. I always brought a sleeping bag so generally was warm. I would eat in the diner because I wanted a real meal .
The upside: there was something "alive" about the hustle/bustle. Since I was generally in the "Atlanta" coach, once we left DC, there were very few folks getting on or off, so not much disturbance that way, but you could sort of feel a low level energy which I appreciated. I found at times in a sleeper, it could almost get lonely!
Sleeper on the way back got me comped meals (so I'd usually get the steak,I've had 2 of top 5 or so steaks in my life on Amtrak... oh those were the days) and a shower. And... yes, sleeping was easier and I'd often setup the roomette in what some have called an "office config" with the bunk prepared for sleeping, but laptop, etc below for work.
Best "coach" trip to Atlanta though was the year they had Business Class. No one next to me so I could get up as I needed and not bother anyone and plenty of room.
Honestly, I'd do business class to Atlanta again in a heartbeat if the price were right.
So... yes, for limited times I'll do coach, but do prefer sleeper.
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