I originally used TikZ for a lot of the diagrams I use for my tex file. However, as diagrams get more complicated (think insanely nested loops with labels everywhere) I find it is usually easier and way less time consuming to crop high quality pictures from PDFs
Here is my routine.
I draw the diagram in power point, this way I get high quality diagram with white background
I save the power point in PDF
I use BRISS to crop the diagram out of the saved PDF, that creates a separate PDF of just the picture, then I insert it into the tex file
However, BRISS only works if your PDF is two pages...any more then there would be an error. Even if it is only two pages, there might be a problem where the entire second page magically gets attached to the cropped image. Needless to say there is some problem with the tool.
Does anyone know any other PDF cropping tool?