> For longer trips they can travel 24/7
That sounds like hell. Bus seats are just as tight as coach class airline seats, and unlike trains there isn't even an option to pay exorbitant pricing for a sleeper compartment.
I guess everything is hell, if you feel like writing that.
> Bus seats are just as tight as coach class airline seats
IME bus seats are first class in padding and support, a bit wider than coach, and with more leg room (though I'd need to measure to confirm). Much more comfortable than airplane coach - and without the air pressure, vibration / noise, and humidity problems.
> exorbitant pricing for a sleeper compartment
It just depends on the train, how far ahead you pay, etc.
Napaway briefly offered ticketed intercity service on busses with 18 sleeper pods, but has (temporarily) discontinued it in favor of focusing on charter service.