Depends on what you're doing. XHTML 1.0 Strict is meant to be a bridge between HTML and XHTML, hence why it still supports Transitional and Frameset. XHTML 1.1 is closer to a pure XHTML spec with less "backwards compatibility."
Either way, unless you're using your HTML with XML, you're fine using regular HTML. Personally, I use XHTML 1.0 Strict regardless.
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