Q2G2, J-Tek type igniters or e match, pyrodex, what's the difference?

I have no experience with igniters and have built several rockets of the winter months incorporating ARRD and Peregrine CO2 technologies. The ARRD instructions call for the use of "e match, pyrodex" and the CO2 ejection canister calls for either Q2G2 or J-Tek type igniters.

Are these all different technologies, are some just generic terms and in the case of the peregrine which one would be considered a more reliable option.

Links to web stores would be helpful, keeping in mind I am located in Canada which may be an issue when shipping some of these items?

Pyrodex is a Black Powder Substitute, like you find in most Gun Stores for Muzzleloaders.
Q2G2 is an Ignitor made by Quest.