It really comes down to what you want to do with the panorama in terms of presentation. From your post, it's obvious that you want HTML support for mobile devices.
There are a number of free and paid Panorama 360˚ hosting sites that offer a range of services for the panoramic photographers we use. Montreal Web Hosting. The range of sites allows you to create tours, add media, embed your panoramas/tours, publish to Google Earth and share via social media. The list is long and the features are suitable for almost all requirements.
The question to ask when choosing a site for theWeb hosting your panoramas is how do you want to be able to access and post them outside of their respective sites, do you also want to be able to post your panoramas to a timeline Facebook or embed them in an external website. All sites allow you to embed your panorama into an external website and provide the code to do so!
From a portfolio perspective, ease of use, interface quality, I think it's hard to beat Round Me. I'm doing a bit of development work for HMD right now and RoundMe VR support is excellent.
