In general, I think XHTML was an improvement over HTML. But if you’re looking at a site with lots of legacy code or starting a new project with untrained web developers, you’re likely to get questions: which should we use? Is it worth spending extra effort for stricter web standards compliance?
Below are a few articles comparing and explaining differences between the two, from the least to the most technical:
- Ask the W3C: HTML or XHTML?
- W3Schools XHTML vs HTML
- Web Standards ROI
- XHTML 1.0 Specification: differences between HTML and XHTML
- Better Living Through XHTML