Ronan. Cooler meaning, cooler vibe. I'd rather date a Ronan than a Roan or Rowan, I'd rather be friends with a Ronan. I'd rather have a Ronan on my side and I wouldn't want a Ronan for an enemy.
That's something I had never taken the time to consider. Ronan does sound like he'd be a better friend or date than the other two. The name just seems wittier, more outgoing, and more spontaneous than Roan or Rowan.