My views are objective and simply regarding facts found in the source material :
"When Obi-Wan Kenobi duels his former apprentice Darth Vader aboard the Death Star, both combatants know they are but shadows of their former selves."
- Source: Fightsaber Article
"Obi-Wan and Kit had been engaged for an hour now, each seeking holes in the other’s defense. Obi-Wan swiftly discovered that Kit was the better sword fighter, astonishingly aggressive and intuitive in comparison with Obi-Wan’s more measured style. But the Nautolan gave himself deliberate disadvantages, hampered himself in terms of balance, limited his speed, emphasized his nondominant side to force himself to full attention, the kind of full attention that can be best accessed only when life itself is at risk. To relax and feel the flow of the Force under such stress was the true road to mastery."
- Source: Cestus deception