I thought Hide was for shaking off spotting, not resisting Matrix Perception when running silent.
You're right. I misread the original question.
You were right the first time. It's a defensive opposed test, and when doing defensive tests, you use the appropriate deck rating plus an attribute. Kind of like you use two attributes to dodge and attribute plus armor to resist damage.
Define what you mean by "shaking off spotting" because honestly I don't think you can do any "hiding" of that sort at all in 5E.
If someone spots you while you are running silently, you can attempt to lose them by using a Hide action.
Good lord. What's the price scaling on these things if that's a Rating 1? Even if device ratings have dropped by one across the board it's still probably cheaper to boost your Response and Signal than it would be for someone to get a deck good enough to get through.
Whole new paradigm. Response and Signal no longer exist. The only four matrix attributes now are Attack, Sleaze, Data Processing, and Firewall.
Commlinks run between 100¥ and 8000¥ and only have Data Processing and Firewall, but cannot hack or run decking programs. (You no longer need programs to do things like data search and such).
Cyberdecks, on the other hand, also have Attack and Sleaze attributes, which you must have to do any kind of hacking. These run between 50,000¥ and 825,000¥.