Don't know how I missed this thread
The sitting/standing controversy has been going on for at least a good fifty (50) years. Prolly longer, but I'm only aware of that time span. As an old - then young - cripple, I've been through more desk/chair height configurations than most folk even know exist. There is no single answer, as too much of the answer is dependent upon the physics of a given body. Someone who weighs 300-400 pounds will not fare well at a standing desk - knees and ankles in particular will suffer, but lower back will be affected as well. On the other hand, someone 4'11" and ninety (90) pounds will do much better.
The physics - read ergonomics - of any desk have an effect on carpal tunnel, lower back, upper back between the shoulders, neck, shoulders & collarbone area whether sitting or standing. And the chairs for most desk configurations are seldom optimal for long-term desk usage. And if it's a standing desk, it had best be the right height for you
, or there will be suffering. (Of course, the same thing is true of a sitting desk/chair combo.)
Over the years, I've used several variants of the ball chair, the knee chair (very good for my back, posture wise, but hell on the knees regardless how well padded), some specialty multi-adjustable office chairs. The best thing I've found to date - for me - is an old-fashioned stenographer's chair, but they're getting damned hard to find
, guess there ain't any old-fashioned stenographers around any more
Anyway, half-a-century of direct experience has convinced me there is no one-solution-fits-all answer to this particular conundrum. Basically, you'll just have to experiment to see what works best for you - but don't expect it to work for everyone - or anyone? - else.