What are the differences between a ticket purchased online and a normal ticket?

Tickets purchased online
can be bought via the Internet until shortly before departure.
can be displayed directly on your desktop or on your tablet/smartphone or printed out. They can be displayed even without SBB Mobile.
are personal, i.e. they are only valid in conjunction with a form of personal ID (passport, ID card, driving licence, Half Fare travelcard, GA travelcard).
are dated and valid for a limited time.
とか、
What distinguishes an OnlineTicket from an ordinary ticket?
can be purchased online until shortly before departure.
can be printed at your desk.
are personalised, i.e. only valid in conjunction with a personal identity document (passport, ID card, driving licence, Half-Fare or GA travelcard).
are limited to a set date and time.
cannot be refunded at the ticket counter.
Tickets are only valid on one calendar day per leg of the journey. You must specify your travel dates when you purchase your ticket. Subsequent changes or exchanges are not possible. OnlineTickets issued by fare networks may have a different period of validity (e.g. 2 hours, 24 hours etc.).とかがあります。

割引なしローカル切符はオンラインで買わない方が良いのが一般的です。