... my desire is to have the most perfect ammo I can possibly make. ....
If you are referring to cases that meet a standard like SAAMI, I'm not sure if any one particular trimmer can accomplish this. Most of the trimmers I've seen fall into two categories: those that trim based on overall case length and those that trim based on the case shoulder. They both work differently and yield different results.
If you size a case based on the overall case length, you are forced to rely on the accuracy of your sizing process and hope that the case and shoulder have been properly sized such that the case fits in the chamber as it should. If the shoulder is not properly formed, the case will either fit too deep into the chamber or not enough. The former condition mimics a round with excessive head space while the latter, a round that is too long for the chamber.
Conversely, if you use a trimmer that works off the shoulder, its possible to see variations in overall case lengths by a few thousands of an inch because the case length is not what is being sized. While I have no way of verifying this, I surmise that the variation is caused by an imperfect resizing process that's exacerbated when resizing mixed brass. When you consider the difference between a go gauge and no go gauge (e.g. .004" for a Forester .308 gage), one would think that sizing off the case shoulder could raise an issue with safety. I'm just not sure it does in the real world, however.
I started off using the lee case length trimmer gauge when I first started to reload my ammo. This trimmer works off of overall case length and makes quick work when the case is chucked in a universal lock stud and drill. The problem I encountered with this tool is that the gauge stud can and does screw/unscrew on its own, changing the overall case length over time with use. Another problem is that the trimmer aligns itself with the rod and case mouth. If your chuck wobbles, it will cause the case to wobble and deform the brass. Additionally, the spinning of the rod can wear the case mouth.
I moved on to using the Lee Deluxe Quick Trim Tool. This tools is super fast and easy to use when a drill is attached. It trims off of the shoulder and deburs and chamfers the case mouth at the same time eliminating the need to do so after sizing. Its a good way to do a lot of brass like .223. However, because sizing is done off of the case shoulder, the overall case lengths tends to vary by a few thousands of an inch. This is more evident when resizing a mixed batch of brass.
If I had to guess which trimmer will yield the most "perfect ammo" in terms of case length, I would go with a trimmer that sizes on overall case length. If you are searching for the trimmer that will yield "perfect ammo" in terms of accuracy, I would opt for a trimmer that works off of the shoulder.