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When does one need StringJoin as opposed to StringExpression? I don't know of an example where s1<>s2<>...<>sn works but s1~~s2~~...~~sn does not.

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    $\begingroup$ From here "StringExpression is closely related to StringJoin, except nonstrings are allowed and lists are not flattened. For pure strings, they are equivalent." $\endgroup$
    – Jason B.
    Commented Nov 25, 2015 at 12:31
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    $\begingroup$ Generally, you should consider StringJoin as on operation for joining strings together, while StringExpression is meant for pattern matching strings when using functions like StringCases, StringMatchQ and StringPosition. A StringExpression is much more like a regular expression in that sense. $\endgroup$
    – Sjoerd Smit
    Commented May 8, 2017 at 13:14

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Based on @Jason B's comment, StringJoin can handle (and flattens) lists.

StringJoin[{"Ab", "cd"}, {"ef"}] returns Abcdef, whereas StringExpression[{"Ab", "cd"}, {"ef"}] returns {"Ab", "cd"} ~~ {"ef"}.

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    $\begingroup$ But it works too, StringCases[ "bf", {"b", "d"} ~~ {"f"}], so what works better? :) $\endgroup$
    – Kuba
    Commented Nov 25, 2015 at 13:05

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