I was looking up train tickets on the Indian rail website for travel between New Delhi and Udaipur. There are 5 of us. The Mewar express is currently Waitlist for AC1 and Chetak Express is RAC for AC2. Which one should I book and have a higher chance of getting onto the train? Is there a big difference between AC1 and AC2? We were hoping to travel AC1 if possible but Chetak express doesnt seem to have that class.