What file format is better for Print medium eps or ai?

Hi All,
I was hoping that you all could help me.  My final output is imported into InDesign and printed either by an offset printer or conventional plate and ink printing. For over 15 years I have been saving my files as eps files. The best file type at the time for this purpose.  However, now I have been hearing a lot of buzz that the eps file is old school and the now a file should be saved as an ai file even for printing. My files are mainly graphs and charts but they have to be high quality.
My question is is that true.  Is saving as an ai file now better even when the output is printed.  Will it cause anymore problems?  Will the output quality be as high?  Does it matter which version I am using?  Right now I am using CS4?  Would it work in CS3 as well?  Is there anything that I have to look out for?
I do like the fact that the ai file can be opened in a reader.
I would really appreaciate your feedback.
Thanks,
Carolyn

As long as it's being imported to InDesign, PDF is generally more versatile.
Understand: when you import an AI file into InDesign, you are not importing native AI content; you are importing PDF. That's why you have to use the "PDF Compatibility" option when saving the AI file. That option embeds another complete version of the file as PDF content.
To see this, simply try to place an AI file which was not saved with the "PDF Compatibility" option into InDesign. You'll get an error.
That's why you can also simply Save As or Save A Copy as PDF and leave off the "Illustrator Editibility" option. The AI content is ignored by InDesign anyway.
PDF is not more universally supported than EPS. EPS is still needed by many non-PostScript programs. Microsoft Word, for example, cannot place a PDF file as a spot graphic on Windows--probably the most common scenario when providing graphics to business clients for internal use. EPS is also understood by many other programs in other environments and industries. For example, there's still a whole world of sign shops using cutting software which can open an EPS, but cannot open a PDF.
JET

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