Protege5 Brake Swap / Upgrade questions

Gents, I just got the front calipers off a speed 6 to do the common upgrade. However, I have a speedprotege parts car and those calipers look larger or similar. Which is the better brake? My parts car's calipers are in way better condition and will make it way easier to refresh and paint them so just wanted to see if anyone knows more about this. Thanks!
 
That begs the question should I go with the msp brakes or speed 6. I planed to use the msp rear brakes for mine since I'm assuming I wouldn't have to deal with the E brake issue you have when doing the speed 6 rear brakes.
 
That begs the question should I go with the msp brakes or speed 6. I planed to use the msp rear brakes for mine since I'm assuming I wouldn't have to deal with the E brake issue you have when doing the speed 6 rear brakes.
I have a speed and I plan on doing mazda 6 fronts with my msp rears otherwise there is a bunch of s*** you would have to do to make the 6 rears work like you said, also rear brakes aren't near as important as your fronts, 70% of your stopping power comes from the front, so I dont think there would be much improvement with a smidgen larger rear brakes.
 
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