What you have read is true, A and C are the best tours - I did all four of them.
The companies will get you there and feed you. Don’t expect too much more, they are there to get their job done.
I did four tours while I was there, the places you go are amazing but the level of care from the operators seem impacted by their familiarity of the setting - it’s special to you, not to them after the thousandth time!