I've done both and they're both great scenarios. If forced to choose I'd go with the overnight, but it should be with an ATF and not a first-time session.
I think the main thing about overnight is you need to make sure you click we'll otherwise after all the sex is over you might drive each other crazy. I've done both but prefer overnights with the right woman.
Having had two sessions back to back before and while still amazing (and exhausting in a great way), would have to say overnight myself, but would agree with the masses here that would have to be done with the right lady you click well with on more than just a physical level. As they said in Indiana Jones, I had "chosen wisely" for my first experience.
Had both.
I have never went to a session before hand expecting to do an over night.
So, interpret that as you will.
And no, I never had to chew my arm off to not disturb the person in order to make my getaway
Overnights are great, but only if the price is right. Most providers take their hourly rate and offer very little discount on a per hour basis for what will mostly be chill down time unless you are some sort of a super stud who can maintain an erection for hours.
Had one nice overnight where we had take out sushi, played, then drinks in the the hottub, laid in bed and watched a movie of her choice, played, slept, took her to breakfast, then a quick bng and bye. Was only $$$ + drinks and meals, a deal for both of us as she had no hotel / meal / drink expenses for the evening.
Kallie of Dallas does a reasonable overnight, although her rates have gone up to $$$$$$$$.
If overnight is too high, I'd rather just book an hour here and there.