Here is a quick graph showing the ME / PE / Output values for each of the decryptors. This is based on a 200mm AC II blueprint (max run).
(click to expand)
It is pretty self-explanatory. The baseline (dark blue) is a -4 ME, -4 PE and a 10 run copy. If we use a "cryptic processor" it makes it a -3 ME, 3 PE and a 10 run copy.
Some decryptors are geared towards ship or large item invention and some are better suited for module invention. You just need to weigh out the pros and cons and roll with it. Isk/Hour will help you immensely when it comes down to decisions.
Hopefully this is a quick reference for what decryptor does what and you can use this image during your invention process.
As always, Fly safe-ish.