Erza admires and uses Anakin's training holograms. But I guess it's difficult to measure how technically skilled he is compared to Obi Wan; they specialize in different forms, after all.
What we do know is that Anakin can use jar'kai as a padawan sufficiently to surprise and put Dooku on the offense, and if we're using Legends, creates his new lightsaber form for his suit within a matter of weeks while incorporating elements from a variety of forms and fighting styles. He's obviously pretty technically skilled.