I can't speak for all printers, but for the vast majority of jobs, we love (properly created) PDFs (built to final trim size, 1/8 bleed, at least 1/8 margins, all fonts embedded, image resolution at least 200ppi, ideally all spot colors converted to process, unless printing as spot, black type consists of only black (does not contain CMY). Of course covers with spot varnish or pages with black plate changes, for example, require a little extra work before submitting, but we still prefer PDFs. There are times when we prefer a Packaged InDesign, but that is very rare.
Thanks for asking.
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