What is the difference between e-ticket & i-ticket in Indian railway ticket booking ?

Indian Railways i-Ticket and E-Ticket Booking
Both i-Ticket and E-Ticket are the Internet Online Booking tickets via http://www.irctc.co.in/ but these 2 tickets having some difference that difference is explained as follows
i-Ticket
In the case of i-Ticket service charge of Rs.40 per ticket in lower class and Rs. 60 per ticket in upper class (maximum 6 passengers per ticket) is leviable in addition to the train faire.
But this type of service will delivered the ticket without any extra cost. And maximum 10 tickets booked in an individual account.
Will get the e-mail to the mail id you are provided in the IRCTC  says the total fare taken for the ticket and the beth position of your ticket.
If the ticket is not booked then that information you will get from the menu "Booked Ticket History" in the http://www.irctc.co.in/ site home page.

E-Ticket
Indian Railways started E - ticket facility since 24.02.2006 to provide fast and secure online ticketing for the passengers.
But in this case the passengers not provided any physical tickets. You can take the print out from the internet anytime after your ticket booked successfully.
In the journey time you have to carry any of the following identity details that is the main difference in the case of E-ticket.
Voter Identity Card
Passport
PAN Card
Driving Licence
Photo identity card issued b the Central / State goventment

If you are forgot to take any of these you will be treated as traveling without ticket. And if you are not carrying the ticket with you then you have to charge Rs. 50.
In the case of E-Ticket service charge of only Rs.10 to 25 per ticket in lower class and Rs. 20 to 40 per ticket in upper class (maximum 6 passengers per ticket) is leviable in addition to the train faire.
As part of the my concern better you go for E-tickets