Apollo is good, and the credits are pretty cheap which is nice. Some of the outbound features are less evolved though. I had built most of our outbound in AmpleMarket which was a great tool, though credits were quite expensive, so when we were ramping up outreach I used Apollo and webhooks to enrich the info in HubSpot and AmpleMarket.
Couple reasons why we didn't switch over entirely from AmpleMarket- the LinkedIn intent features were quite good (pretty sure it's similar to Clay in that regard). Also, the customization of A/B testing outbound messaging and conditional values in the tokens in the email were great, so as to reduce likelyhood of being flagged automatically as spam).
