What is the difference between flash format and html 5 format in publish setting?

 Answer:

If you publish a virtual tour in Html 5 format, you can view it on mobile devices and PC. 

If you publish a virtual tour both in flash format and html 5 format, when you view the tour on PC, it will display the flash format and when you view the tour on mobile devices, it will display the html 5 format. 

Besides, some features which related with flash in Tourweaver can only supported in flash format, you can see the comparison from the link below: http://www.easypano.com/comparison/functions-tw7.html