We are planning to take a train from Roma Termini to Naples and continue on Circumvesuviana to Sorrento. We will have carry-on luggage on wheels, not big suitcases. I looked at the train schedule on trenitalia website, and there are A, ES and IC+ trains around the time we will arrive at Roma Termini from the airport.
I see that A trains are the fastest and also the most expensive. I am wondering whether we need limit ourselves to A or ES 1st class seats if we don't want to worry about safety or comfort. Could you please share thoughts on this? Are second class seats on IC+ OK? Can we just show up at Termini and buy tickets on any train leaving next?
Thank you so much in advance for your responses!