A contact database tells you who exists. It does not tell you why a person matters, what is happening at their company, or what to open with. That work still lands on the seller, usually across two or three other tools.
Buzzlist keeps the search and adds the rest: your Hive so it knows what you sell, Sales Briefs so you know what to say, and written emails written for one person at a time.
The pricing differs too. Buzzlist publishes a flat monthly price with no seat minimum. See the sourced comparisons: Buzzlist vs Apollo and Buzzlist vs ZoomInfo.