Which of the two surgeries would you consider to be the hardest to recover from? Tummy tuck & breast reduction or thigh lift?

Dear sweetfobz,
Because the tummy tuck incorporates muscle tightening, this is the more difficult to recover from, meaning more discomfort. The other operations you listed are essentially skin procedures that do not touch the underlying muscle, so are less painful.
I would encourage you to consult with a board certified plastic surgeon so they can perform a history and physical, and review the procedures that make the most sense for you. They can also address your question specifically based on the plan chosen.
Best to you as you proceed.