I will be in venice this January 2014 and will be taking the train to Rome. Seems that there are two train companies connecting the two cities. What are the differences between the Italo and trenitalia?
I noticed that the one train goes into the Termini station and the other one to the Tiburtina. I am staying near the Trevi fountain. So would the advantage of a faster train be lost in the cab ride to the hotel?