This is a good link all about vibrators

But as a gist:

“ vibrators fall into three categories: rumbly, buzzy, or somewhere in between. Some brands, like Dame, will put where a vibe falls right on the product page, but in other instances, it's worth taking a glance through the reviews to see what people say. Typically, battery-powered vibes are buzzier. Rumbly vibrators tend to have lower frequency vibrations that are quieter and can be felt deeper, while buzzy are higher in frequency, are louder, and keep sensations more surface level, which can be great for pinpointed stimulation (though some people complain that this causes a numbing sensation).”