Need advices regarding signature tunning...

Hi,

I reviewed several IDS/IPS products and I concluded that there is two kind
of signatures languages.
First one, the simplest, allows attack detection customization by changing
some value in the signature, or allows creating new attack by adding a one
line rule (snort rule).
Second one, the hardest,  allows full signature or new protocol state machine
development. by mean of a complete programming language (N-code).

I would like to know what are the pro/cons of using both methods. I would
appreciate some feedback from some real life experiences, if possible.

TIA.

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