Not an expert
I'm no expert, maybe you'll benefit from talking to a sports trainer but I'll put in my two cents. I think climbing with either standing and sitting will use lots of muscles in the legs and hips. However I think the sitting with high cadence will be better for you if you've had hip injuries because you would be putting less instantaneous power into the hip flexors and extensors with each step. I think it will decrease the chances of re-injuring yourself. Hope this helps, I must say that a more professional opinion will probably be better!