What is the best (fastest) way to travel from Granada to Ronda?
The train from Granada to Ronda is most comfortable and easy. Not sure if it is the fastest, by car it is about 2 hours.
The train wouldn't be a bad option for you. If you haven't checked out the train schedule, here's the website: www.renfe.com. It would take about 3 hours and run you about 20 euros per person. I would also suggest using blablacar. It's usually cheaper, a bit faster since the drivers don't usually make as many stops as trains or buses do and it's a great way to meet people, but it all depends on if drivers are going when you would like to go. For buses, use the website alsa.es. I did not see anything going directly from Granada to Ronda though. Buena suerte!