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When using UTF-8, which character reference is better, or more widely supported worldwide on various browsers… using decimal references or hex references?
UPDATE
For instance, for replacing quotation marks…
" or "
which one is better to use, and why?
All HTML entities use only the ASCII subset, so the fact that you encode your document in UTF-8, as opposed to any other byte oriented encoding which extends ASCII, is unrelated.
Anyway:
When using UTF-8, you can just copy and paste the relevant characters into the document, without references at all. E.g. StackOverflow does not convert this ⫅ to an entity (see the source of this page).
If you prefer using entities, then I would use the hex references purely since this is the way Unicode codepoints are usually written in the charts. References are so widely supported that I do not think that you will head a compatibility problem with neither hex nor decimal references.