what should i do when backup ?

[liou zhaoxing]

hi everyone ,
those days,i face a problem. when i want to backup mysql data with innodb engine,there is some one who advised me to use mysqldump .so ,this is the puzzle i confused .
when i adopt the command mysqldump to backup with innodb engine,should i use the option --opt or not ?
i got the answer on this forum to use it --opt (advised to me )
but when i read a book writen by Michael Kofler ,he(she)recommands me like this :
mysqldump -u root -p
--skip-opt --single-transaction --add-drop-tables \
--create-options --quick --extended-insert \
--set-charset --disable-keys databasename >backup.sql (The Definitive Guide to Mysql 5 the third version,page 324)
so ,it seems like paradox for me to do ,so what should i do ?when i backup mysql data with innodb engine ?