Never played with the Trinity but have done some Predator installs.
I don't know if the Trinity has trans temp built in. If it's not listed on their website then it's a possibility it could be added but you'd also need a sensor and wiring. Not sure how you would interface this with the PCM.
I'd rate 1 - Programmer, 2 - Intake or Exhaust. Usually the intake feels like much more as the throttle response improves with a CAI installation.
Just understand that these three items are dependent on one another to maximize potential gains. More Air In + More Air Out = More HP and Torque; More Air In + More Air Out + Programmer = More HP and Torque plus as now you have a tool that will tweak your engine settings to take advantage of the Air In and Out.
So not one of these things on their own makes a huge difference.
Go to my "Ram Mods" link below my siggy pic and got to Page 2 for some real world results, before and after installation of the Predator, shown on the dyno sheets. Those gains are with a K&N drop in filter and an exhaust done. I have since added an AFE CAI and got the throttle response improvement plus a Butt Dyno measured gazillion HP & LB Ft Torque improvement.