I’d argue it’s neither - black holes are an embodiment of chaos and entropy, they are a force of nature; are earthquakes, storms, solar flares etc … high or low vibe?
The question doesn’t make much sense, to me at least.
I see, personally, vibration levels as something’s ability to draw closer to the true blueprint intended by Divine Mind (at a given universal status quo) … If something is a direct expression thereof, I don’t think it qualifies for such a classification.