Overall, I prefer Wistia because of how easy it is to add, brand, and look at viewing statistics for it. You can get 5 free videos and they were doing it long before Vidyard, even though they’ve made great strides with HubSpot Video and integrating with HubSpot. Wistia is just more of our preference for a professional solution.
That said, YouTube is always a safe option, they have some statistics now and there are HubSpot modules that you can use now to put them into beautiful popups instead of ugly iframes and embed codes.
Hope that helps!
Jesse