Do you guys consider the harbingers room in jorrvaskr and the ragged flagon cistern homes?
Because they are pretty good.
Only places I consider "home" is places that have secure storage that won't randomly disappear on you and that your wife can live and be available to give you your daily $100 allowance.
Ragged Flagon...definitely NOT.
Since I am not 100% sure the room you inherit after finishing the main Companion or College or Dark Brotherhood or Blades quest lines are safe, I stick with the purchased houses.
It would be nice if there is a listing of all of the places where secure long term storage is located.
Based on that your options could very well open up.
My favorite base of operations would then be the big cave that has ships inside (forget the name).
Beautiful scenery and much more open than most of the caves.
A bit inconvenient to have to run all the way to the far end to do smithing and you would have to travel to a town to do much trading.