The verdict
Ask what is actually slowing you down. If your store gets traffic but your list is not growing, I'd test Customers.ai on the trial and measure the real match rate. If the problem is explaining things to clients, prospects or colleagues without a calendar fight, I'd pick Loom.
For most small B2B teams, I'd start with Loom. It is simple, it has a free plan and it needs no legal analysis. Customers.ai raises privacy and consent questions, and in the Netherlands and the rest of Europe you must check your legal basis before you contact people who never signed up.