I bought a pinless middle chainring for my good road bike, but that's only because I hardly ever, ever use the small chainring. If you use the small chainring wtih any frequency, then it's worth getting a chainring with shifting pins. Especially if you have indexed front shifting, this becomes almost a necessity. If you've got friction front shifting, not so big of a deal. With a hybrid, I suspect your front shifting is indexed.
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"c" is not a unit that measures tire width