Jiko is one of, if not the best, meals we have had at WDW. It's unique, more upscale (but not stuffy!), service was perfect, and we love the atmosphere. I can't find anything similar to the menu locally.
Sanaa is very good but more standard Indian food. There is nothing on their menu that I can't find locally. Most Indian restaurants even offer great bread service

It's a beautiful restaurant but we have had mixed service in the past (it's just not as polished).
I don't think you can go wrong w either but Jiko would win that choice every single time.