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Your Translation
Advantajes: The resulting text is written with very natural words and expressions, it is more accurate than the AT (Systran) translation and it is better organized.
Disadvantages: It is very easy to make mistakes, you are not a perfect machine. Also, you have to spend lots of time.

AT
Advantajes: It is very fast, you can translate a very large texts in almost a few seconds.
Disadvantages:It does not use natural english phrases and makes some mistakes.

CAT
Advantajes:It is the better of boths, you can look up terms in the dictionary you do not know.
Disadvantages:Is not as fast as Systran.