Hello i have just registered for an account here in gz

I need some opinions on whether i should choose HTML5 or XHTML 1.0 in designing my website.

I have a school project where we have to make a website for a client with a real-life issue (eg a business, organisation, etc.). And one of the requirements is to use a variety of resources like questionnaires, surveys, telephone interviews, emails, etc. for researching. Right now I'm at the stage where I'm starting to develop my final solution. I need to decide whether to stick with the old, stable XHTML or go with the new, hyped up HTML5 (leaning towards HTML5). I need your help guys. Here is my survey:

[url=http://goo.gl/LI9Fo]Software Usage at Work (Survey)[/url] >>click the link

Please fill in this survey.