The base HP of a C-1 frame is 210 shields and 120 armour, for a total of 330 HP (the ratio of shield:armour doesnGÇÖt actually matter to an element neutral weapon). With the complex shield extender, that goes up to 402 HP.
Both rifles have a base DPS of 430 (about average for an assault variant rifle in 1.7). The damage modded one has a DPS of 473.
It will take the extender-fit frame 0.76 seconds to kill their opponent.
It will take the damage mod fit frame 0.84 seconds to kill their opponent.

All other things being equal, the extender fit frame wins the fight.
LetGÇÖs look at the proto level. Consider a ck.0 with four extenders vs a ck.0 with three extenders and a damage mod. The base DPS of the rifles has jumped to 470, due to the higher tier gear. The damage modded rifle now hits 517 DPS.
The extender fit ck.0 has 553 shields and 150 armour, for a total of 703 HP.
The damage mod fit ck.0 has 631 HP.
It will take the extender-fit frame 1.34 seconds to kill their opponent.
It will take the damage mod fit frame 1.36 seconds to kill their opponent.

Hard to get creative in Dust when most of the advance work is going towards legion. If this is legion brain storming then I'd could come up with quite a few, but here is one just to keep it simple and to keep it in line with CCP's tweaking of armor.

Rattati seems to be asking for feedback and this isn't a topic covered in one of the sticky threads so I thought I'd post it here.

This isn't about armour. This is about high slot modules in general. I'm not really suggesting new ones so much as I'm suggesting tweaks to the ones we have.

As someone mentioned somewhere sometime ago, giving Myofibril stimulants a bonus to jumping power might make it more attractive. It's easy to see how the same module that gives you added punching power can do the same for your legs.

Don't think it'd be difficult to implement since armor plates seem to add a penalty to jumping speed as guessing by the SDE data, the relevant attributes seem to be these:

mCharProp.movementSprint.jumpSpeed
mCharProp.movementRun.jumpSpeed

Having Myofibril stimulants give their bonus to these attributes will likely make you jump higher :p, curse those railings!

If myo's gave +100% to jump height and speed, I would be using a 3x complex myo, 3x kincat scout and jumping 20+ meters a jump. None would escape my nova knives.

Key:
(--) high slot
(-) low slot

So my suggestion is:

High slot modules:

>Shields

*Shield extenders (--) {high CPU/low PG}

*Shield booster (--) {Regulator} {high CPU/Low PG}
(Numerical increase to shield repair values or a timed boost to shield HP)

>Kinetic catalyzer (--) {low CPU/High PG}
(Does not affect strafing speeds can counter forward
speed loss for Armor but agility remains slow, similar to EVE)

>Profile dampener (--) {high CPU/Low PG}

>Code breaker (--) {vanilla}

>Range amplifiers (--) {vanilla}

Low slot modules:

>Armor

*Armor plate (-) {high PG/Low CPU}

*Armor repairers (-) {high PG/Low CPU}

*Reactive plates (-) {low PG/High CPU}

*Ferro scale plates (-) {med PG/med CPU}

>Cardiac regulators (-) {high PG/ low CPU}

>Damage amplifiers (-) {low PG/High CPU}

>Shield recharging

*Shield energizer (-)

*Shield rechargers (-)

>Precision enhancers (-)

There is a balance between utility modules between lows and highs.

Lows contain shield utility modules, damage modifiers, stamina modules, precision enhancers , and armor.

Highs contain utility modules, speed modifiers, dampeners, and shields.

This leaves shield extenders as the one module worth using for the majority of situations (the exceptions being if you are a scout or a sniper).