The verdict
For a small B2B team, I'd pick Clarity to start. It is free, setup takes minutes and you will learn something about your site within a day. It is a low-risk way to find out how visitors behave.
I'd pick Trackdesk only when a partner programme is already paying its way and a spreadsheet is the bottleneck. Do not buy it to test the idea. If you are still checking whether partners sell, begin with something lighter. Both have an API and an official MCP server, though Trackdesk keeps full API and MCP access on the higher plans, so check the plan you need.