Best .ISO making tool?

hello community,

i want to make an iso from a data dvd. which one would you consider to
be the best tool for doing that? i have done a lot of iso writing with
several linux distributions, and i made the experience that nero (and i am sorry
to say that, because i don’t like this software since version 5.x) that nero
was the tool which did the most reliable job in iso writing.
but now i want to write an iso for backing up and it needs to be without
errors (it is an ubuntu6.10 dvd that came with a pc magazine)

sorry for the long text and the short question: what is the best .iso making
tool?

edit./
what about winimage for doing the job? it does well with cd’s

Read using DVD Decrypter in ISO read, then burn in ISO write mode…

Thanks for your Answer, but i have found out how it works very well for
me:
Reader was a LG GDR8163B, Writer was a LG GSA-4082b FW A209.

I used Winimage to read the ISO file and burned with Nero on a Verbatim
MCC 03RG20. The Copy was perfect!

anyway, thanks for reading!