Which train service is best? We will be traveling venice/florence/rome. Thanks for the help!
There is no big difference. Check both and choose the schedule and the price that you find more convenient.
Some trains of Italo stop in Roma Tiburtina or in Roma Ostiense, but it's no big issue. Both from Tiburtina and Ostiense you can take the metro, and Rome is so large that even the "main" station, Termini, can't be regarded as ideal to reach any single spot.
Select based on schedule and price.
There is one but access is limited to a specific part of Trenitalia users as well as the proper "lounge" of "Casa Italo".
It's really a matter of costs and timetable - nothing more. All Trenitalia and NTV trains between Venice and Rome call in Roma Tiburtina. All Trenitalia's and a few of NTV's call in Roma Termini. Other NTV's ones terminate in Roma Ostiense.
They're basically the same comfort wise and they run the same carriages. Treni is certainly larger with more trains and more routes than Treno, but Treno runs almost 50% less in cost. Some stations aren't as central or main as Treni, but in those cities the metro will suffice to get you where you need to be.
I'll be happily using Treno next time I'm in Italy.
Treni means trains, Treno means train. What are you talking about?
He's short cutting Italo<Treno> and <Treni>talia.