First, we’re talking about priming tools costing between $200 and $700! Then, this isn’t a thread about priming tools (grin). And, the OP seems to be leaning toward a powered trimmer rather than a priming tool. All that said, all of these priming tools ARE different to each other. Hand primers are of varying quality but all have the advantage of better “feel” in the priming process, allowing the user to feel when the primer seats. The downside is hand fatigue. The Derraco tool copied mechanics of the Primal Rights CPS, but moved them to a tool that mounts like a die into a reloading press. Advantages are speed and removal of hand fatigue and cost as compared to the CPS. Disadvantage is that you’re using a reloading press, designed to “crush” cartridge cases into shape, to insert primers. It works and it works well, but there is absolutely no feel (yes, I’ve used both the Derraco tool and I have the CPS). CPS has massive mechanical advantage, but not as much as a reloading press. It is much smoother, and it preserves the capacity to feel primer seating. As
@muleystalker wrote, they’re not the same at all. A Lee Pro progressive press is the “same” as a Mark 7 Apex 10 or a Dillon RL1100 in that they all progressively load cartridges. That analogy isn’t intended to knock one and boost the others, it’s just an example of a similar comparison of the Derraco to the CPS. If cost is your primary concern, there are several very good hand primer tools. If a compromise is desired between best/fastest/most precise and lowest cost, then Derraco is a really good option. If you’re looking for the “best”, consider CPS. As always, YMMV.