so now 7 years late i reply in saying shaak ti wins the fight. ti went up against grievous and starkiller. she was regarded as one of the best female fighters- using ataru and makashi techniques aided by her ability to fight multiple opponents, ducking and darting with ease . ataru was used by sidious, makashi by dooku. ti was on the council obviously chosen for her power and accomplishments.
unduli uses soresu which is defensive more than offensive. while unduli is a superb acrobat, her loose flexible joints are a weakness to be exploited by harsh strikes. she was use to fighting alongside her padawan, not alone. luminara was elevated to master around the battle of naboo, shaak ti sat on council less than half a decade later. shaak ti trained 3 padawans while unduli only trained 1. luminara lacks experience with duals. she only ever fought ventress and failed.
shaak ti is on equal par with mara jade and depa billaba, better than adi gallia, bultar swan and aayla secura by a small margin.