Originally by: Cpt Branko

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Do a check info on them.

Nanofiber Internal Structure - reduced mass at expense of structure HP (12.5% less mass for T2)

Inertia Stabiliser - increased agility at expense of increased sig radius (20% better agility)

Meaning:
Nanofibers give you better agility (acceleration and handling) and better speed when using a speed boosting module (AB or MWD). Reduced structure HP isn't a terrible drawback - gives you less buffer if you're using a damage control, but in a speed-fitted ship, that's not that terrible.

Istabs give you better agility (better then the nanofiber), but no extra speed, and the increased sig radius means you'll get locked faster & easier, and missiles hitting you (if they hit you) will do more damage.

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Originally by: Mr Krosis

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Cpt Branko sums it up well.

I would also mention their value when compared to related rigs. The inertia and mass reduction rigs are both -15% while Tech II Inertia Stab / Nanofiber are -20% / -12.5%. This often leads to speed setups where you put overdrive/inertia in lows with mass reduction rigs.

Also, for bumping purposes their can be an advantage to having higher mass as I think that is part of the velocity transfer when you bump someone. I know I've had heavier ships bump lighter ships, and had the lighter ship move away much faster than the heavier ship was moving when it bumped.

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