Looking for a solid integration tool from HubSpot to Microsoft Dynamics. Any suggestions?

Develop, Build & Integrate Marketplace Apps
2

I did not use it but Zapier can be one-way https://zapier.com/apps/hubspot/integrations/microsoft-dynamics-crm .
If you are not already using it, they have a trial period so you can test and see if that solves your problem.
Cheers