Europe Trip 2017

Hello Sir/Madam
I am travelling to Europe in Summer.
We are a group of 10 with 4 adults and 6 kids (ages: 9, 9, 10,13, 13, 15 yrs).
Our itinerary is travel from Paris to Interlaken and then Interlaken to Milan; Milan to Venice; Venice to Florence; Florence to Rome
Given the travel from France to Switzerland to Italy with a group of 10, would it make sense to do Railpass Select or should I just buy rail tickets.
Please advise: should we get rail pass vs rail tickets
Any discounts since we are travelling as a group of 10.
Thank you.
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