Generally, the SRD contains the official errata pertaining to its contents. If it doesn't (either because it's not updated or because the errata is of a book not covered in the SRD), then I'm pretty sure errata takes precedence, since the SRD is just a listing of rules text, rather than an official source. I think even the books themselves overrule the SRD unless the text in the SRD reflects later changes (and the errata, by definition, overrules books printed before the errata was issued).