the SD5 is the more "common" a la "counter-strike" version you'll see in movies, games, etc.
Also, my personal experience with CA is next to none, however, there is volumes to be said about the fact they have multiple "model versions", whereas TM puts out one near flawless version that does not require revision...
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"And the Lord said unto John, 'Come forth and receive eternal life.' But John came fifth and won a toaster."
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