The verdict
For a small B2B team that runs webinars regularly and uses HubSpot or Salesforce, I'd pick Livestorm. You can test it on the free plan, and the EU hosting helps if you sell in Europe. If you also run in-person or hybrid events and want one platform for the whole programme, pick BigMarker.
Watch how each one charges. Livestorm uses attendee credits, so a bigger audience raises the cost and a bigger team does not. BigMarker has no public prices, so go in with attendee numbers, host count and formats. Livestorm's API and MCP server need switching on through support.