BookMyShow is an Ideal choice for many people for booking tickets online.
Thoigh it has many rivals like TicketsOnline, Paytm ( Recently launched) , It has excelled in this service.
Positives
1) It has the visibility of almost all theatres & movies in any respective city In which we try to book. ( Multiplexes / Single screen etc ).
2) It is fast & easy to use, while displaying seat layout, or movies.