The verdict
If you sell to a defined list of companies and your site gets steady visits, pick Albacross. It shows which target accounts are interested without asking them to fill in a form. If phone calls bring in revenue and you spend money on ads, pick CallRail. For trades, clinics, legal firms and home services, I'd say it is close to a must. Most small B2B software teams have a funnel of forms and demos, so Albacross is the likelier fit. If nobody calls you, CallRail adds nothing. If your traffic is small or mostly consumers, Albacross has little to identify.