Noob augmentation questions, What's the difference? Options

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Hi everyone, first post here.

I'm a total Shadowrun noob. I'm currently playing a technomancer in a friend's game, and I like to think I'm doing reasonably well at it, but by the character's very nature he's hyperspecialized in one particular area (hacking, obviously). To broaden my system familiarity a bit, I've decided to make another character that lives in a completely different region of the rulespace. In full '80s nostalgia mode, I want to try to put together a corp ninja, stuffed to the eyeballs with non-cyber augmentation to assist in his dual roles of infiltration and silent, close-up killing.

I'm still totally unfamiliar with the nuances of the various augmentation types though, so can someone give me a quick rundown on the meaningful general differences between bioware, genetech and nanotech augmentation? Is one category better for my purposes? Is a mixture of types in a single character advantageous or a waste of essence/nuyen? Why? Any info you can provide along these lines is a big help.

Thanks.