How to Code Double Quotes via HTML Codes
There really aren't any differences.
" is processed as " which is the decimal equivalent of &x22; which is the ISO 8859-1 equivalent of ".
The only reason you may be against using " is because it was mistakenly omitted from the HTML 3.2 specification.
Otherwise it all boils down to personal preference.
Google recommend that you don't use any of them, source.
There is no need to use entity references like
&mdash,&rdquo, or☺, assuming the same encoding (UTF-8) is used for files and editors as well as among teams.
Is there a reason you can't simply use "?