The Paizo site is more accurate, but d20PFSRD is easier to navigate and search.
For example, there's this word salad on d20PFSRD:
An alchemist can create three special types of magical items—extracts, bombs, and mutagens are transformative elixirs that the alchemist drinks to enhance his physical abilities—both of these are detailed in their own sections below.
Cross-referencing with Paizo's site, this is how the same paragraph reads there:
An alchemist can create three special types of magical items—extracts, bombs, and mutagens. Bombs are explosive splash weapons, and mutagens are transformative elixirs that the alchemist drinks to enhance his physical abilities—both of these are detailed in their own sections below.
Yes, it looks like a case of the d20PFSRD transcriber omitting a line, but that line's still missing, and that missing line hampers understanding. Thus if it's important go with Paizo for accuracy.