Active / Passive sensors

[Ruatha]

I do belive that all sensors does the same, i e a hyperoptics level 2 scans all cloaking level 2, as does other scanners as psychicreceptors etc.

But in the description it says that Hyperoptics does passive scanning, and if you go up a level the tachyonscensors do active scanning.
Is there any use in researching tachyonsensors or should I settle with Hyperoptics?