so i'm really wondering how much better would a fuel/ignition controller or split second air/fuel controller? i'm looking at the 2 on protogegarage.com and not sure how either of them would actually be.

AEM fuel/ignition controller
or
split second air/fuel controller

benefits?
cons?

are these better alternatives to an access port tuner? or standalone if i want all my stock electronics stuff to still work?

i've got a 2004 mazda 3 2.3L